# Math vocab.

## Cicumference

The distance around a circle

## Radius

A line segment from he center of the circle to any point on the circle

## Chord

A line segment with both endpoints on the circle

## Diameter

A line segment that passes through the center of the circle With its endpoints on the circle

## Central angle

With its vertex at the center of a circle

## Arc

A segment of the circle

## Semicircle

Half of a circle

## Pi

The ratio of the circumference C of any circle to its diameter D

## Surface area

The sum of the areas of all the faces of a solid

## Net

A two dimensional pattern that you can fold to form a solid(three dimensional figure)

## Volume

The measure of the amount of space a solid figure occupies( area of base x H)

## Line

A series of points that extends in two opposite directions without ends

## Line segment

Consist of two endpoints and all the points of the line between the endpoints

## Ray

A line with a starting point, but no ending