| A | B |
|---|
| area of triangle | 1/2 b times h |
| area of parallelogram | b times h |
| area of circle | pie r squared |
| circumference | pie times d or pie times 2r |
| area of trapezoid | 1/2 h (b1 + b2) |
| supplementary | sum of angles measure 180 |
| complementary | sum of angles measure 90 |
| acute | angle less than 90 degress |
| obtuse | angle greater than 90 degrees |
| right | angle measuring 90 degrees |
| triangle | sum of angles measure 180 degrees |
| isoceles | at least 2 congruent sides |
| equalateral | 3 congruent sides |
| diameter | side to side through center of circle |
| radius | center of circle to outer edge |
| rectangle | parallelogram with 4 right angles |
| square | parallelogram with 4 right angles and 4 congruent sides |
| rhombus | parallelogram with 4 congruent sides |
| parallelogram | quadralateral with both pairs of opposite sides parallel and congruent |
| trapezoid | quadralateral with exactly 1 pair of parallel sides |
| quadralateral | a closed figure with 4 sides and 4 angles |
