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12,56 = 3,14 x d
12,56/3,14 = d
4 = d
diameter 4 cm, maka jarijari 4:2 = 2 cm
Luas = πr²
= 3,14 x 2²
= 3,14 x 4
= 12,56 cm²
12,56 = 6,28 x r
12,56 ÷ 6,28 = r
2 = r
L = 3,14 x 2^2
= 3,14 × 4 = 12,56 jugaaa