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= 40 cm : 2
= 20 cm
L = π × r²
= 3,14 × 20²
= 3,14 × 400
= 314 × 4
= 1256 cm²
L = πr^2
= 3,14 × 20 × 20
= 3,14 × 400
= 314 × 4
= 1256 cm^2