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28 Cards in this Set

  • Front
  • Back
Classify angles by size
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
Points which lie on the same line
Points, lines, rays, or segments which lie on the same plane
Two rays (sides) with a common endpoint (the vertex).
Angle Bisector
A ray which divides an angle into two congruent angles
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)
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.
A statement of fact accepted to be true without proof
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.
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.