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80 = 1/2 * 16 * PR
80 = 8 * PR
PR = 80/8
PR = 10 cm
80 = 16 x d2 ÷ 2
80 x 2 = 16 x d2
160 = 16 x d2
160 ÷ 16 = d2
10 = d2
jadi diagonal PR= 10 cm