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Luas seperempat lingkaran
= 1/ 4 × π × r × r
= 1/4 × 3,14 × 10 × 10
= 314/4
= 78,5 cm²
Luas semua lingkaran 78,5 × 4 = 314 cm²
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panjang persegi panjang = 10+10+10 = 30 cm
lebar persegi panjang = 10+10 = 20cm
Luas persegi panjang
= p × l
= 30 × 20
= 600 cm²
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Luas daerah yang diarsir
= 600 cm² - 314 cm²
= 286 cm²
jawabannya A.