| A | B |
|---|
| acute angle | angle between 0 and 90 degrees |
| right angle | angle equal to 90 degrees |
| obtuse angle | angle between 90 and 180 degrees |
| straight angle | angle equal to 180 degrees |
| triangle | three sided figure |
| quadrilateral | four sided figure |
| pentagon | five sided figure |
| hexagon | six sided figure |
| heptagon | seven sided figure |
| octagon | eight sided figure |
| nonagon | nine sided figure |
| decagon | ten sided figure |
| undecagon | eleven sided figure |
| dodecagon | twelve sided figure |
| interior angle sum of a triangle | 180 degrees |
| interior angle sum of a quadrilateral | 360 degrees |
| interior angle sum of a hexagon | 720 degrees |
| interior angle sum of an octagon | 1080 degrees |
| transversal | line which crosses 2 or more lines |
| polygon | many sided figure |
| circle | all points equidstant from a given pt |
| area of a circle | pi * r squared |
| perimeter of a circle | 2 * pi* r |
| area of a triangle | 1/2 base * height |
| area of a trapezoid | 1/2 height * (b1 + b2) |
| area of a square | side squared |
| area of a rectangle | base * height |
| area of a parallellogram | base * height |
| point, line, plane | undefined terms |
| collinear points | points together on the same line |
| Triangle Inequality | In triangle ABC, AB + BC> AC |
| Pythagorean Theorem | c squared = a squared + b squared |
