| A | B |
|---|
| acute triangle | has 3 acute angles |
| obtuse triangle | has one obtuse angle |
| right triangle | has one right angle |
| quadrilateral | a polygon with four sides and four angles |
| trapezoid | has one pair of parallel sides |
| parallelogram | has two pairs of parallel sides; EACH PAIR of parallel sides are the same length |
| rhombus | has two pairs of parallel sides; ALL sides are the same length |
| rectangle | has two pairs of parallel lines; EACH PAIR of parallel sides are the same length; has 4 right angles |
| square | has two pairs of parallel lines; all sides are the same length; has 4 right angles |
| line of symmetry | divides a shape into two parts; both parts are the same size and the same shape |
