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L = 1/4 . π . d²
= 1/4 . 3,14 . 20²
= 1/4 . 3,14 . 400
= 100 . 3,14
= 314 Cm²
R = 40/2=20
Π = 3,14
L = Πr(pangkat2)
= 3,14 x 20 x 20
= 1256