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Verified answer
3,14 x (40:2) x (40:2)
3,14 x 20 x 20
3,14 x 400
314 x 4
1.256
r = d/2 = 40/2 = 20 cm
Penyelesaian:
L = π x r²
L = 3,14 x 20²
L = 3,14 x 400
L = 1256 cm²