| Term | Definition |
|---|
| equiangular | angles are equal |
| equilateral | all sides are equal |
| regular | sides and angles are equal |
| isosceles | two sides are equal |
| scalene | no sides are equal |
| right triangle | contains one right angle |
| acute triangle | contains all angles less than 90 degrees |
| obtuse triangle | contains one obtuse angle |
| parallelogram | opposite sides are equal and parallel, tipped rectangle |
| rhombus | all sides are equal, opposite sides are parallel. Tipsy square |
| rectangle | parallelogram with all right angles |
| square | rhombus with all right angles |
| trapezoid | 1 set of parallel sides |
| polygon | a shape with many sides |
| triangle | has three sides |
| quadrilateral | shape with four sides |
| pentagon | shape with five sides |
| hexagon | shape with six sides |
| septagon | shape with seven sides |
| octagon | shape with eight sides |
| nonagon | shape with nine sides |
| decagon | shape with ten sides |
| equiangular | angles are equal |
| equilateral | all sides are equal |
| regular | sides and angles are equal |
| isosceles | two sides are equal |
| scalene | no sides are equal |
| right triangle | contains one right angle |
| acute triangle | contains all angles less than 90 degrees |
| obtuse triangle | contains one obtuse angle |
| altitude of a triangle | height. Must be perpendicular to a side |
| parallelogram | opposite sides are equal and parallel, tipped rectangle |
| rhombus | all sides are equal, opposite sides are parallel. Tipsy square |
| rectangle | parallelogram with all right angles |
| square | rhombus with all right angles |
| trapezoid | 1 set of parallel sides |
| point | represented by a dot |
| line | goes on forever in both directions, draw with arrows on ends |
| line segment | 2 endpoints, can be measured |
| ray | one endpoint, arrow at other end |
| angle | two rays joined at a vertex |
| vertex | shared endpoint of an angle, must be in the middle when naming |
| degrees | how angles are measured |
| right angle | exactly 90 degrees |
| acute angle | measures less than 90 degrees |
| obtuse angle | measures between 90 and 180 degres |
| midpoint | divides a line segment into two equal segments |
| parallel lines | lines will never cross ex. Railroad tracks |
| perpendicular lines | make a 90 degree angle when they meet |
| complementary angles | add to 90 degrees |
| supplementary angles | add to 180 degrees |
| vertical angles | angles opposite each other in an "x", they are equal |
Combine with other sets
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