Quadrilaterals

Geometry SHAPES AND FIGURES OF PLANE GEOMETRY Example: Calculate the area and perimeter of a parallelogram with base (b) = 4´, height (h) = 3´, a = 5´ and b = 4´. Be sure to include units in your answer. Solution: A = bh P = 2a + 2b A = (4)(3) P = 2(5) + 2(4) A = 12 square feet P = 10 + 8 P = 18 feet A rectangle is a parallelogram with four right angles, as shown in Figure 11. Figure 11 Rectangle The area of a rectangle is calculated using the following formula: A = (length) (width) = lw (3-5) The perimeter of a rectangle is calculated using the following formula: P = 2(length) + 2(width) = 2l + 2w (3-6) The area of a rectangle is always expressed in square units, and the perimeter of a rectangle is always expressed in the original units. Rev. 0 Page 9 MA-03