Lines
An exact location in space. Represented by a point and is used to tell the exact location in space
Point
This is the term for a 90-degree angle
Right angle
Triangle
3
The point halfway between the endpoints of a line segment. It is the exact middle and is equally distant from both endpoints
Midpoint
A straight, one-dimensional figure that has no thickness and extends forever in both directions. It is made up of an endless collection of points
Line
An angle that is less than 90 degrees
Acute Angle
Circle
0
Two shapes or figures are exactly the same in size and shape.
Congruence
A part of a line that starts at one endpoint and extends endlessly in one direction.
Ray
An angle that is greater than 90 degrees
Obtuse Angle
Rectangle
4
Two angles whose measures add up to 90 degrees. They form a right angle together, but they don't have to be adjacent.
Complementary Angles
Part of a line that is bounded by two distinct endpoints. It does not go on forever—it only includes all the points between and including the endpoints
Segment
This is the number of degrees in a straight angle
180 degrees
Pentagon
5
Two angles whose measures add up to 180 degrees. When adjacent, they form a straight line, but can also be separate angles adding to 180°.
Supplementary Angles
If point B is between points A and C on a straight line, then the length of AB plus the length of BC equals the length of AC
Segment Addition
This is used to measure angles
Protractor
Heptagon
7
two adjacent angles whose measures add up to 180 degrees.
Linear Pair