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78 Cards in this Set

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What is an equilateral triangle?
All three sides of the triangle are the same length.
All three angles are of equal measure.
What is an Isosceles triangle?
A triangle with two sides the same length.
two angles of equal measure
What is a scalene triangle?
A triangle with no sides the same length.
no angles of equal measure
Define a right triangle.
A triangle with 1 right angle which measures 90 degrees.
2 other angles are acute.
Define an acute triangle?
A triangle with 3 acute angles.
The angles measure less than 90 degrees.
Define an obtuse triangle.
A triangle with 1 obtuse angle.
One angle measures more than 90 degrees but less than 180 degrees
A square has......
Quadrilateral
4 right angles
4 equal sides
2 pairs of parallel sides
A rectangle has......
Quadrilateral
opposite sides are equal
Two pairs of parallel sides
Four Right Angles
Parallelogram
A quadrilateral
opposite sides equal in length
Two pairs (opposite sides) of parallel sides
Describe a rhombus.
A quadrilateral
Two pairs of parallel sides
Four EQUAL sides
Describe a trapezoid.
A quadrilateral with exactly 1 pair of parallel sides.
Describe a kite.
A quadrilateral with 2 adjacent sides.
The measure of all the angles of a triangle equal_________ degrees.
180 degrees
Parts of a circle:

A chord is_________
A line segment with endpoints on the circle.
Parts of a circle:

A diameter is_____________
a chord that passes through the center of the circle
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
parts of a circle:

A Central Angle is _________
an angle formed between 2 radii.
Opposite central angles have the same measure.
What is the relationship between the diameter and the radius of a circle?
The radius is one half the length of the diameter.
How many degrees are in a circle?
360 degrees
Define similar figures.
figures that have the same shape.
What is an open figure?
An open figure is a two dimensional figure that does not start and end at the same point.
What is a closed figure?
A closed figure is a two dimensional figure that starts and ends at the same point.
What is an irregular polygon?
A polygon whose sides and angles are not all the same lengths and measures.
What is a regular polygon?
A polygon with congruent sides and congruent angles.
Define a hexagon.
A 6sided figure
6 angles.
6 vertices
It is an irregular polygon.
Define a pentagon.
A 5 sided figure
5 angles.
5 vertices
A regular polygon
Define octagon.
An 8 sided figure
8 angles.
8 vertices
It is an irregular polygon.
Define decagon.
A 10 sided figure
10 angles
10 vertices
Irregular polygon
Define a point in geometry.

.S .R .C
An exact location in space.
Say "point A"
Define a line in geometry.
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:
Define a plane in geometry.
A flat surface that continues with no end in all directions.

Say " plane KLM"
Write: "plane KLM"
Define a line segment in geometry.
It is a part of a line
has two endpoints

ex; say line segment AB or line segment BA
Define endpoints in geometry.
A point at the end of a ray or a line segment.
Define a ray in geometry.
A part of line and has one endpoint and continues without end in one direction.
Ex:
Say "ray JK" or write JK
Define an angle in geometry.
It is formed by two rays with a common endpoint.
Define Vertex.
The endpoint of an angle.
An angle is measured with a _____________.
protractor
An angle is named by______________.
its three points and in degrees.
A right angle measures_______________
exactly 90 degrees
An acute angle measures_____________
less than 90 degrees
An obtuse angle measures_______________
greater than 90 degrees but less than 180 degrees.
A straight angle measures__________
180 degres
Define Intersecting lines
Lines that meet or cross at a common point.
Define perpendicular lines.
Intersecting lines that cross each other at right angles.
Define parallel lines.
Lines in the same plane that never intersect.
All the angles of a triangle add up to how many degrees?
180 degrees
What is the sum of the measures of all the angles of a quadrilateral?
The sum is 360 degrees.
Define slide in congruence and motion.
Moves a figure horizontally, vertically, or diagonally.
Define a flip in congruence and motion.
Moves a figure to its reverse side over a real or imaginary line.
Define a turn in congruence and motion.
Moves a figure by rotating it around a point.
Congruent means__________________.
Same size and shape
Corresponding parts means_____________________
Matching parts of congruent figures
A figure is symmetric if_______________.
it can be folded along a line so that the two halves match exactly.
Define line of symmetry.
A line that divides a figure into two parts that match, or are congruent.
Define ordered pair.
A pair of numbers that gives the location of a point on a graph, map, or grid.
Define coordinates.
The numbers in an ordered pair.
Define Plot.
To locate points on a coordinate grid.
Quadrilateral
4 sides
4 angles
4 vertices
ex: square, rectangle, trapezoid
Triangle
3 sides
3 angles
3 vertices
Congruent
same shape
same size
Similar
same shape
different size
Translation
a slide
moves a figure to a new position along a straight line
Rotation
a turn
moves a figure around a point
Perimeter
The distance around the outside of a figure
to find the perimeter: ADD up ALL the sides
example: fence around a yard
Polygon
straight sides
needs to be closed
3 or more sides
Reflection
a flip
flips a figure over a line
Vertical Angles
2 angles across from each other,
mirror images,
congruent
complementary angles
2 angles that have a sum of 90 degrees
corresponding angles
2 angles that are in the same position
Transversal
a line that crosse4s 2 parallel lines
alternate exterior angles
2 congruent angles that are outside of the parallel lines
alternate interior angles
2 congruent angles that are inside of the parallel lines
skew
2 lines on different planes that never cross
equiangular
Special name given to a triangle with 3 equal sides
Supplementary angles
2 angles that have a sum of 180 degrees
Complementary angles
Angles that have a sum of 90 degrees
corresponding angles
angles that are in the same position
adjacent angles
2 angles next to each other that share a side