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1/2.12 = 6 cm
maka: sisi = akar dr 8²+6²
= akar dr 64+36
= √100
= 10 cm
jadi, K = 4.s = 4.10 = 40 cm
= √64 +36
= √100
sisinya = 10
K = 4 x s
= 4 x 10
= 40
Jadi, keliling belah ketupat 40 cm