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Jawaban terlampir

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A. 22 x 8 = 176 - 1/2 x 22 x 8 = 88 jawaban = 176 - 88 = 88 cm. B. 20 x 16 = 320 - 1/2 x 20 x 8 = 80 jawaban = 320 - 80 = 240. D. 20 x 12 = 240 - 1/2 x 8 x 20 = 80 x 2 = 160 jawaban = 240 - 160 = 80 cm.C. 12 x 6 = 72 cm - 1/2 x 5 x 6 = 15 jawaban = 72 - 15 = 57 cm