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p × l =
20 × 16 = 320
L belah ketupat=
d1 × d2 ÷ 2
10 × 10 ÷ 2 = 50
L segitiga = a × t ÷ 2
16 × 10 ÷2 = 80
L tot = 320 + 50 - 80
Ltot = 290