| A | B |
|---|
| right angle | A 90 degree angle. |
| equilateral triangle | A triangle with all sides equal. |
| right triangle | A triangle with one internal angle equal to 90 degrees. |
| pentagon | A polygon with 5 sides and 5 angles. |
| square | A rectangle having all four sides of equal length. |
| intersecting lines | Lines that cross each other. |
| perpendicular lines | Two lines that cross each other to form a 90 degree angle. |
| acute angle | An angle less than 90 degrees. |
| radius | A straight line extending from the center of a circle to the surface. |
| line segment | One part of a line. |
| line | A continuous extent of length. |
| rectangle | A quadrilateral with opposite sides parallel. |
| hexagon | A six sided figure |
| obtuse angle | An angle greater than 90 degrees. |
| quadrilateral | A polygon with 4 sides |
| regular polygon | A polygon whose sides are equal measure and whose angles are equal measure |
| octagon | A polygon with 8 sides. |
| decagon | A polygon with 10 sides. |
| nonagon | A polygon with 9 sides |
| isoscoles | A triangle with 2 sides of equal measurement. |
