# 3rd Quarter Vocab- Part 3

## 13 terms

### area

the number of square units needed to cover a given surface

### center

the point inside a circle that is the same distance from all the points on the circle

### circle

the set of all points in a plane that are the same distance from a given point called the center

### circumference

the distance around a circle

### cone

a three-dimensional figure with one vertex and one circular base

### cylinder

a three-dimensional figure with 2 parallel, congruent circular bases connected by a curved lateral surface

### diameter

a line segment that passes through the center of a circle and has endpoints on the circle, or the length of that segment

### perimeter

the distance around a polygon

### pi

the ratio of the circumference of a circle to the length of its diameter

a line segment with one endpoint at the center of a circle and the other endpoint on the circle or the length of that segment

### sphere

a three-dimensional figure with all endpoints the same distance from the center

### surface area

the sum of the area of the faces, or surface of a three-dimensional figure

### volume

the number of cubic units needed to fill a given space