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Verified answer
Luas ABCD = 10 x 10= 100 cm²
Luas 2Δ kanan = 5 x 5
= 25 cm²
Luas Δ1 kiri = 1/2 x 5 x 10
= 25 cm²
Luas Δ2 atas = 1/2 x 5 x 5
= 12,5 cm²
Luas arsir = 100 - 25 - 25 - 12,5
= 37,5 cm²
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