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78 Cards in this Set
- Front
- Back
What is an equilateral triangle?
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All three sides of the triangle are the same length.
All three angles are of equal measure. |
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What is an Isosceles triangle?
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A triangle with two sides the same length.
two angles of equal measure |
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What is a scalene triangle?
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A triangle with no sides the same length.
no angles of equal measure |
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Define a right triangle.
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A triangle with 1 right angle which measures 90 degrees.
2 other angles are acute. |
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Define an acute triangle?
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A triangle with 3 acute angles.
The angles measure less than 90 degrees. |
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Define an obtuse triangle.
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A triangle with 1 obtuse angle.
One angle measures more than 90 degrees but less than 180 degrees |
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A square has......
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Quadrilateral
4 right angles 4 equal sides 2 pairs of parallel sides |
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A rectangle has......
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Quadrilateral
opposite sides are equal Two pairs of parallel sides Four Right Angles |
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Parallelogram
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A quadrilateral
opposite sides equal in length Two pairs (opposite sides) of parallel sides |
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Describe a rhombus.
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A quadrilateral
Two pairs of parallel sides Four EQUAL sides |
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Describe a trapezoid.
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A quadrilateral with exactly 1 pair of parallel sides.
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Describe a kite.
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A quadrilateral with 2 adjacent sides.
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The measure of all the angles of a triangle equal_________ degrees.
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180 degrees
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Parts of a circle:
A chord is_________ |
A line segment with endpoints on the circle.
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Parts of a circle:
A diameter is_____________ |
a chord that passes through the center of the circle
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parts of a circle:
Radius or Radii is________ |
a line segment that extends from the center of the circle to a point on the circle
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parts of a circle:
A Central Angle is _________ |
an angle formed between 2 radii.
Opposite central angles have the same measure. |
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What is the relationship between the diameter and the radius of a circle?
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The radius is one half the length of the diameter.
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How many degrees are in a circle?
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360 degrees
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Define similar figures.
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figures that have the same shape.
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What is an open figure?
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An open figure is a two dimensional figure that does not start and end at the same point.
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What is a closed figure?
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A closed figure is a two dimensional figure that starts and ends at the same point.
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What is an irregular polygon?
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A polygon whose sides and angles are not all the same lengths and measures.
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What is a regular polygon?
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A polygon with congruent sides and congruent angles.
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Define a hexagon.
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A 6sided figure
6 angles. 6 vertices It is an irregular polygon. |
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Define a pentagon.
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A 5 sided figure
5 angles. 5 vertices A regular polygon |
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Define octagon.
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An 8 sided figure
8 angles. 8 vertices It is an irregular polygon. |
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Define decagon.
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A 10 sided figure
10 angles 10 vertices Irregular polygon |
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Define a point in geometry.
.S .R .C |
An exact location in space.
Say "point A" |
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Define a line in geometry.
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A series of points in a straight path that is endless in both directions with no endpoints.
ex: say line ST or line TS Write: |
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Define a plane in geometry.
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A flat surface that continues with no end in all directions.
Say " plane KLM" Write: "plane KLM" |
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Define a line segment in geometry.
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It is a part of a line
has two endpoints ex; say line segment AB or line segment BA |
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Define endpoints in geometry.
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A point at the end of a ray or a line segment.
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Define a ray in geometry.
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A part of line and has one endpoint and continues without end in one direction.
Ex: Say "ray JK" or write JK |
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Define an angle in geometry.
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It is formed by two rays with a common endpoint.
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Define Vertex.
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The endpoint of an angle.
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An angle is measured with a _____________.
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protractor
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An angle is named by______________.
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its three points and in degrees.
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A right angle measures_______________
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exactly 90 degrees
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An acute angle measures_____________
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less than 90 degrees
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An obtuse angle measures_______________
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greater than 90 degrees but less than 180 degrees.
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A straight angle measures__________
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180 degres
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Define Intersecting lines
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Lines that meet or cross at a common point.
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Define perpendicular lines.
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Intersecting lines that cross each other at right angles.
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Define parallel lines.
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Lines in the same plane that never intersect.
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All the angles of a triangle add up to how many degrees?
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180 degrees
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What is the sum of the measures of all the angles of a quadrilateral?
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The sum is 360 degrees.
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Define slide in congruence and motion.
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Moves a figure horizontally, vertically, or diagonally.
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Define a flip in congruence and motion.
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Moves a figure to its reverse side over a real or imaginary line.
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Define a turn in congruence and motion.
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Moves a figure by rotating it around a point.
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Congruent means__________________.
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Same size and shape
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Corresponding parts means_____________________
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Matching parts of congruent figures
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A figure is symmetric if_______________.
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it can be folded along a line so that the two halves match exactly.
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Define line of symmetry.
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A line that divides a figure into two parts that match, or are congruent.
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Define ordered pair.
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A pair of numbers that gives the location of a point on a graph, map, or grid.
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Define coordinates.
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The numbers in an ordered pair.
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Define Plot.
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To locate points on a coordinate grid.
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Quadrilateral
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4 sides
4 angles 4 vertices ex: square, rectangle, trapezoid |
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Triangle
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3 sides
3 angles 3 vertices |
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Congruent
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same shape
same size |
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Similar
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same shape
different size |
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Translation
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a slide
moves a figure to a new position along a straight line |
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Rotation
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a turn
moves a figure around a point |
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Perimeter
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The distance around the outside of a figure
to find the perimeter: ADD up ALL the sides example: fence around a yard |
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Polygon
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straight sides
needs to be closed 3 or more sides |
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Reflection
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a flip
flips a figure over a line |
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Vertical Angles
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2 angles across from each other,
mirror images, congruent |
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complementary angles
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2 angles that have a sum of 90 degrees
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corresponding angles
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2 angles that are in the same position
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Transversal
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a line that crosse4s 2 parallel lines
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alternate exterior angles
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2 congruent angles that are outside of the parallel lines
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alternate interior angles
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2 congruent angles that are inside of the parallel lines
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skew
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2 lines on different planes that never cross
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equiangular
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Special name given to a triangle with 3 equal sides
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Supplementary angles
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2 angles that have a sum of 180 degrees
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Complementary angles
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Angles that have a sum of 90 degrees
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corresponding angles
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angles that are in the same position
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adjacent angles
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2 angles next to each other that share a side
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