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sisi miring = 60:4
= 15
d= 2 x 9
= 18 jawaban C
soal no 10
sisi miring = 40 : 4
= 10
d = 8 x 2
= 16
luas = d1 x d2 : 2
= 12 x 16 : 2
= 96cm² jawaban D