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1/2 d2 =
=
= 12
d2 = 24
L belahketupat = 24 x 10 / 2 = 120 cm²
2 x L segitiga yg saling bertumpukkan = 12 x 5 /2 x 2 = 60
L bangun datar = (400 + 120) - 60 = 460 cm² (C)