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L O =π × r²
440 = π × r²
440 = 22/7 × r²
440 × 7/22 = r²
140 = r²
r = √140 cm
b. L O = 15 cm²
15 = π × r²
15 = 22/7 × r²
15 × 7/22 = r²
105/22 = r²
r = √105/22 cm