| A | B |
|---|
| triangle | closed figure composed of exactly three line segments |
| quadrilateral | closed figure composed of exactly four line segments |
| square | quadrilateral with four sides the same length and four right angles |
| line segment | joining two points in the shortest possible way |
| angle | the union of two line segments with a common endpoint |
| vertex | common endpoint of an angle |
| right angle | any angle identical to an angle formed by horizontal and vertical line segments |
| perpendicular | two line segments that form a right angle |
| isosceles triangle | a triangle with two or three sides the same length |
| equilateral triangle | a triangle with three sides the same length |
| scalene triangle | a triangle which has three sides that are different lengths |
| rectangle | quadrilateral with four right angles |
| parallelogram | a quadrilateral with two pairs of parallel sides |
| kite | a quadrilateral with two nonoverlapping pairs of adjacent sides that are the same length |
| rhombus | a quadrilateral with four sides the same length |
| trapezoid | a quadrilateral with exactly one pair of parallel sides |
| congruent line segments | two line segments that are the same length |
| congruent angles | two angles that are exactly alike |
| equiangular | a figure in which all angles are congruent |
| isosceles trapezoid | a trapezoid in which the nonparallel sides are congruent |
