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12,56 = 2 . 3,14 . r
3,14 . r = 12,56 ÷ 2
3,14 . r = 6,28
r = 6,28 ÷ 3,14
r = 2 cm.
Luas = pi . r^2
luas = 3,14 . 2^2
luas = 3,14 . 4
luas = 12,56 cm2
= 12,56 : 3,14 : 2
= 2 cm
L = π x r²
= 3,14 x 2 x 2
= 12,56 cm²
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