W hen most people think of shapes, they imagine a triangle, a rectangle, or maybe even a fancier- sounding rhombus or ...

You know that the interior angles of a triangle should add up to 180°. Therefore, you can subtract these values from 180° to find the missing angle. A rhombus has four sides of equal length.

Look at this rhombus and square. These two quadrilaterals also share 2 pairs of parallel lines and 4 equal lengths. You can classify and compare shapes by using a Venn diagram. Each shape has been ...