L segitiga besar = 1/2 × 10 × 4 = 20cm^2
L sgitiga kecil = 1/2×4×5 = 10cm^2
L segitiga tak diarsir = 1/2×4×3 = 6cm^2
L diarsir = (20-6)+(10-6) = 14+4 = 18cm^2
maaf kalau salah
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L segitiga besar = 1/2 × 10 × 4 = 20cm^2
L sgitiga kecil = 1/2×4×5 = 10cm^2
L segitiga tak diarsir = 1/2×4×3 = 6cm^2
L diarsir = (20-6)+(10-6) = 14+4 = 18cm^2
maaf kalau salah