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Luas segitiga = (8 cm × 20 cm) / 2 = 80 cm²
Luas setengah lingkaran = (3,14 × 10 cm × 10 cm) / 2 = 157 cm²
Luas Arsir = Luas Persegi - Luas Segitiga - Luas Lingkaran = 400 cm² - 80 cm² - 157 cm² = 163 cm²