r = 12cm
L= 1/4 × π × r²
L= 1/4 × 3,14 × 12 × 12
L= 1/4 × 314/100 × 12/1 × 12/1
L= 1/4 × π × r²
L= 1/4 × 3,14 × 12 × 12
L= 1/4 × 314/100 × 12/1 × 12/1
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