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28 Cards in this Set
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Classify angles by size
Acute Right Obtuse 
Acute angle has less than 90 degrees
Right angle has 90 degrees Obtuse angle has more than 90 degrees 

Complementary Angles

Two angles whose sum is 90 degrees


Supplementary Angles

Two angles whose sum is 180 degrees


Adjacent angles

Two angles that share a vertex and have a common side which is between them


Linear Pair

Two adjacent angles whose sum is 180 degrees, thus forming a straight line


Collinear

Points which lie on the same line


Coplanar

Points, lines, rays, or segments which lie on the same plane


Angle

Two rays (sides) with a common endpoint (the vertex).


Angle Bisector

A ray which divides an angle into two congruent angles


Area

The amount of surface covered by a shape (measured in square units)


Circumference of a Circle

Distance around a circle
C = 2(pi)r 

Perimeter of rectangle

Add all sides
Per.= 2l + 2w 

Perimeter of Triangle

Add all sides.
Per = a + b + c 

Area of Triangle

Area = (1/2) ( b ) ( h )


Area of Circle

Area = (pi) (r) (r)
or (pi) times square of radius 

Congruent Angles

Two angles with the same measure


Congruent Segments

Two segments with equal lengths


Radius of Circle

Distance from the center to a point on the circle


Diameter of Circle

The length of a segment which has both endpoints on the circle AND which passes through the center (equal to 2 times a radius of the circle)


Midpoint

The point on a segment which is equidistant from each endpoint.


Opposite Rays

Two rays with a common endpoint which extend forever in opposite directions, forming a line.


Postulate

A statement of fact accepted to be true without proof


Theorem

A statement which is proven to be true, either as an example or as a problem to be done.


Vertical Angles

When two lines intersect at a point, the nonadjacent angles are called vertical angles.
Vertical angles are congruent 

What are the three transformations

Translation (slide) move but don't change orientation Reflection (flip) across either axis
Rotation (turn) about the origin (0,0) 

image and preimage

The preimage is the original shape, the image is the copy after transforming.


Hypotenuse

The longest side of a right triangle. It is across from the right angle


Legs of right triangle

The two shorter sides, they form the right angle with each other.
