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r² = L/π
= 1256 / 3,14
= 400
r = √400
= 20 cm
K = 2 π r
= 2 x 3,14 x 20
= 125,6 cm
Jadi Kelilingnya yaitu 125,6 cm²
1256 = π x
= 1256 : π
= 400
r = 20
keliling = 2 x π x r
= 2 x 3,14 x 20
= 125,6 cm
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