| A | B |
|---|
| Area | the amount of surface a figure covers |
| Square Inches | how the area of a figure labeled with inches is expressed |
| Square Units | how the area of a figure without labels is expressed |
| Base | the distance across the bottom of a two-dimensional figure |
| Height | the distance along a side of a two-dimensional figure |
| Right Angle | an angle like the corner of an index card; it measures 90 degrees |
| Parallelogram | a four-sided figure whose opposite sides are parallel and of the same length |
| Radius | a line from the center of a circle to any point on the circle |
| Diameter | a line connecting two points on a circle and passing through the circle's center |
| Circumference | the perimeter of a circle |
| Pi | for any circle, the ratio of the circumference to the diameter |
