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luas = ac x cb
= 8 x 15
= 120 jawabn C
jawabn nomer 31
AB =
=
=
= 15
luas = 9 x 12
= 108
d1 x d2 : 2 = 108
15 x d2 : 2 = 108
15d2 = 108 x 2
15d2 = 216
d2 = 216/15
d2 = 14,4
d2 adalah CD . jadi CD = 14,4 jawabn D