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= 3.14 . 12,5 . 12,5 =490,625
a.) d = 13 maka r-nya r = d/2 r = 13/2 = 6,5
L = π x r²
= 3,14 x 6,5²
= 3,14 x 42,25
= 132,665 cm²
b.) d = 25 maka r-nya r = d/2 r = 25/2 = 12,5
L = π x r²
= 3,14 x 12,5²
= 3,14 x 156,25
= 490,625 cm²
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