SHAPES AND FIGURES OF PLANE GEOMETRYGeometryThe perimeter of a triangle is calculated using the formula:P = side1+ side2+ side3. (3-2)The area of a traingle is always expressed in square units, and the perimeter of a triangle isalways expressed in the original units.Example:Calculate the area and perimeter of a right triangle with a 9" base and sides measuring12" and 15". Be sure to include the units in your answer.Solution:A = 1/2 bh P = s1+ s2+ bA = .5(9)(12)P = 9 + 12 + 15A = .5(108)P = 36 inchesA = 54 square inchesQuadrilateralsFigure 10 ParallelogramAquadrilateralis any four-sidedgeometric figure.Aparallelogramis a four-sidedquadrilateral with both pairs of oppositesides parallel, as shown in Figure 10.The area of the parallelogram is calculatedusing the following formula:A = (base) (height) = bh(3-3)The perimeter of a parallelogram is calculated using the following formula:P = 2a + 2b(3-4)The area of a parallelogram is always expressed in square units, and the perimeter of aparallelogram is always expressed in the original units.MA-03 Page 8 Rev. 0
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