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luas = 1/2 x d1 x d2
96 = 1/2 x 12 x d2
96 = 6d2
d2 = 96/6 = 16 cm
96=1/2*PR*(2*6)
96=1/2*PR*12
96=6*PR
PR=96/6
PR=16 cm
jawabannya yg C.16cm