| A | B |
|---|
| proportion | an equation stating that two ratios are equivalent |
| center | a point that is the same distance from all points on the circumference of a circle |
| trapezoid | a quadrilateral with exactly one pair of parallel sides |
| circumference | the distance around a circle |
| chord | a line segment with endpoints on a circle |
| circle | the set of all points that are the same distance from a center point |
| sector | a portion of a circle enclosed by two radii |
| ratio | a comparison of two numbers using division |
| radius | the distance from the center of a circle to any point on the circle |
| perimeter | the distance around a figure |
| area | the number of square units needed to cover a surface |
| composite figure | a geometric figure made of two or more geometric shapes |
| diameter | the distance across a circle that passes through the center |
| central angle | an angle in a circle with its vertex at the center of a circle |
| Pi | the ratio of the circumference of a circle to its diameter |
