Sonia makes a wooden frame around a square picture. The frame is made of 4 congruent trapezoids. The shorter base is 9 inches, the longer base is 12 inches, and the height is 1.5 inches. What is the area of the picture frame?.
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To find the answer you have to find the area of one trapezoid .Then multipli it by four because all 4 trapezoids are congruent.To find the area of one trapezoid you will use the formula A=(b1+b2)h/2. The b's stand for the bases and h is the height .So,(12+9) X 1.5 first. This equal to 31.5 . Then take 31.5 and divide by 2 to get 15.75 square inches for one . 15.75X4=63 square inches . I have included a pic to show you why a trapezoid uses the formula it does ..
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