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400 - (22/7 x r²) = 246
400 - 246 = 22/7 x r²
154 = 22/7 x r²
= r²
49 = r²
r =
r = 7 cm
= 20 cm × 20 cm
= 400 cm²
Luas lingkaran = Luas persegi - Luas daerah yang diarsir
= 400 cm² - 246 cm²
= 154 cm²
L = π × r²
154 = 22/7 × r²
154 × 7/22 = r²
7 × 7 = r²
49 = r²
√49 = √r²
7 = r
Jadi jari-jari lingkaran tersebut adalah 7 cm.