There are six special quadrilaterals with different properties. A rectangle has two pairs of equal sides. It has four right angles (90°). The opposite sides are parallel. The diagonals bisect each ...

Parallel lines are lines that never cross each other - they keep the same distance apart from each other. When two lines intersect, the opposite (X) angles are equal. On parallel lines, alternate (Z) ...

When looking at a house, garage, store building or factory, or any of the other thousands of structures we live, work, and play in, look for the simple shapes. Look at the front of a house, and you ...