| A | B |
|---|
| obtuse triangle | triangle with an angle more than 90 degrees |
| acute triangle | triangle with all angles less than 90 degrees |
| right triangle | triangle with one angle equal to 90 degrees |
| equilateral triangle | triangle with three three equal side lengths |
| isoceles triangle | triangle with two equal side lengths |
| kite | quadrilateral with two pairs of congruent sides |
| rhombus | quadrilateral with four equal side lengths |
| parallelogram | quadrilateral with two sets of parallel sides |
| rectangle | quadrilateral with four equal angles |
| square | quadrilateral with four equal angles and side lenghts |
| circle | locus of points on a plane equadistant from a single point |
| ellipse | locus of points on a plane whose sum of the distances from any point on the curve to two fixed points is constant |
| trapezoid | quadrilateral with one pair of parallel sides |
