| A | B |
|---|
| point | location in space |
| line segment | part of a line |
| circle | closed plane |
| vertex | intersection point of two sides |
| acute angle | angle less than 90 degrees |
| obtuse angle | angle more than 90 degrees |
| right angle | angle that is exactly 90 degrees |
| transversal | a line which intersects two other lines |
| perpendicular | two lines that intersect at right angles |
| straight angle | measures 180 degrees |
| complementary | sums of the angles measure 90 degrees |
| supplementary | sums of the angles measure 180 degrees |
| right triangle | a triangle with one 90 degree angle |
| equilateral triangle | all sides are equal |
| scalene triangle | three unequal sides and angles |
| vertical angles | a pair of nonadjacent angles formed by intersecting lines |
| hexagon | a six sided figure |
| decagon | a ten sides figure |
| heptagon | a seven sided figure |
| nonagon | a nine sided figure |
