Geometry Basic Vocabulary (Angles)

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created 5 years ago by sandrarich
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updated 5 years ago by sandrarich
Grade levels:
10th grade
Subjects:
geometry
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1

Angle

The intersection of two non collinear rays at a common endpoint. The rays are called sides and the common end point is called the vertex.

2

Vertex

the common endpoint

3

Angle bisector

A ray that divides and angle into the congruent angles.

4

Complementary angles

Two angles with measures that have a sum of 90.

5

Supplementary angles

Two angles with measures that have a sum of 180.

6

Vertical angles

two nonadjacent angles formed by two intersecting lines.

L 1 and L 3 are vertical angles

L 2 and L 4 are vertical angles

7

Adjacent angles

Two angles that lie in the same plane have a common vertex and a common side, but no common interior points.

8

Linear pair

A pair of adjacent angles whose non common sides are opposite rays.

9

Degree

A unit of measure used in measuring angles and arcs. An arc of a circle with a measure of 1* is 1/360 of the entire circle.

10

Acute angle

an angle with a degree measure less than 90.

11

Obtuse angle

an angle with degree measure greater than 90 and less than 180.

12

Right angle

An angle with a degree measure of 90.