isosceles trapezoid | A trapezoid with one pair of parallel sides and another pair of opposite sides that are congruent. |
parallelogram | A quadrilateral with two pairs of parallel sides. |
polygon | A closed plane figure with three or more straight sides. |
quadrilateral | A four-sided polygon. |
rectangle | A quadrilateral with two pairs of parallel sides and four right angles. |
rhombus | A quadrilateral with four congruent sides. |
square | A quadrilateral whose sides are all congruent and which has four right angles. |
trapezoid | A quadrilateral with one pair of parallel sides. |