| A | B |
|---|
| acute angle | An angle with measure greating than 0 and less then 90. |
| trapezoid | A quadrilateral with one pair of parallel sides. |
| pentagon | A polygon with five sides. |
| polygon | A two-dimensional closed figure of straight line segments connected end to end. |
| circle | A set of points at a fixed distance (radius) from a point (center). |
| right triangle | A triangle in which one angle is a right angle. |
| parallelogram | A quadrilateral with poth pairs of opposite sides parallel. |
| hexagon | A polygon with six sides. |
| scalene triangle | A triangle with no equal side lengths. |
| obtuse angle | An angle with measure greater than 90 and less than 180 |
| rhombus | A quadrilateral with all four sides of equal length. |
| quadrilateral | A polygon with four sides. |
| parallel lines | Two straight lines ona two-dimensional plane that do not intersect no matter how far they are extended. |
| isosceles triangle | A triangle with two or more sides of equal length. |
| rectangle | A quadrilateral with four right angles. |
| right angle | An angle that measures 90. |
| perpendicular lines | Two lines on a plat surface which make a right angle when they meet. |
| square | A special rectangle with all sides of equal length. |
| octagon | A polygon with eight sides. |
| equilateral triangle | A triangle with all side of lengths equal. |
