Angles
Basic Definitions
Difficult
Lines
100

The intersection of two rays at an endpoint.

What is an angle?

100

Made up of points with no thickenss or width.

What is a line?

100

The line that divides something into two equal parts

What is a bisector?

100

A measurable part of a line consisting of two endpoints.

What is a line segment?

200

Two angles with measures that sum to 90° (do not have to be adjacent)

What is complementary angles?

200

Location with no size or shape.

What is a point?

200

Points that lie on the same plane.

What is coplanar?

200

Two lines that intersect at a 90° angle (right angle) *symbol: ⊥*

What is perpendicular?

300

Two angles with measures that sum to 180° (do not have to be adjacent)

What is supplementary angles?

300

A flat surface made up of points and extends indefinitely in all directions.

What is a plane?
300

Adjacent angles that are supplementary. Combined they form a straight line.

What is a linear pair?

300

A line that extends indefinitely in one direction.

What is a ray?

400

Two angles that share a common side and vertex

What is adjacent angles?

400

Two objects that have the same dimensions and shape

What is congruent?

400

Two angles directly across from each other on intersecting lines. (always congruent)

What is vertical angles?

400

Points that lie on the same line.

What is collinear?