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b d1.d2 = 12.32= 384
√20^2 - 12^2
= √256
= 16
Jadi panjang diagonal lainnya 16 + 16 = 32
b.) Luas belah ketupat = d1 x d2 / 2
= 24 x 32 / 2
= 384 cm^2
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