# Geometry Vocabulary

### By Stanley Kilgo

## Adjacent Angles

Two angles that touch at the same point.

## Alternate Exterior Angles

A pair of two angles that are on opposite outside sides of the transversal.

## Alternate Interior Angles

A pair of two angles there are on the opposite inside sides of a transversal.

## Complementary Angles

Two angles when added up equal 90 degrees.

## Corresponding Angles

where two angles on a transversal are equal

## Supplementary Angles

two angles that add up to 180

## Parallel lines

two lines that don't touch

## Perpendicular Lines

Two lines that are 90 degrees to each other

## Transversal lines

A line that passes through two parallel lines

## Vertical Angles

Angles that are opposite each other.

## Perimeter

the outside of a shape

## Area

the inside of a shape

## Surface area

Area of a single surface

## Volume

how much a shape can hold

## Circumference

area around a circle

## Diamter

one side of a circle to another

## Radius

from the outside of a circle to the middle

## Face

one side of a 3D object

## Edge

where two faces meet

## Vertex

Where two edges meet