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Verified answer
Sisi alasΔ = √25² - √20² = √625 - √400 = √225 = 15 cmluas Δ= 15 x 20/2 = 300/2 = 150cm²
luas persegi panjang = 15 x 10 = 150cm²
luas diarsir = (150+150) - (200) / 2 = 300-200/2 = 100/2 = 50cm²