Study your flashcards anywhere!
Download the official Cram app for free >
 Shuffle
Toggle OnToggle Off
 Alphabetize
Toggle OnToggle Off
 Front First
Toggle OnToggle Off
 Both Sides
Toggle OnToggle Off
 Read
Toggle OnToggle Off
How to study your flashcards.
Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key
Up/Down arrow keys: Flip the card between the front and back.down keyup key
H key: Show hint (3rd side).h key
A key: Read text to speech.a key
78 Cards in this Set
 Front
 Back
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
