Quadrilaterals

  • Quadrilaterals - polygons with 4 sides

    • Parallelograms - quadrilaterals with opposite sides parallel

      • Area = BH (base x height)

      • ex; b = 6, h = 4

        6 × 4

        Area = 24

      • Opposite angles are equal

      • Adjacent angles (angles next to each other) always sum to 180°

      • Opposite sides have equal lengths

    • Rectangle - all angles equal to 90°

    • Rhombus - all side lengths are equal

  • Trapezoids - quadrilaterals with one pair of opposite sides parallel

    • Area = (B1 + B2 / 2) x H

      • B = base, H = height

    • ex; b1 = 8, b2 = 10, h = 6

      (8 + 10 / 2) x 6

      9 × 6

      Area = 54