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L=1/2*314
L=157 cm2
d = 20 cm ----> r = 1/2 x d
= 1/2 x 20
= 10 cm
Maka,
L = 1/2 x
L = 1/2 x 3,14 x 10²
L = 1/2 x 3,14 x 100
L = 157 cm²
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