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62.8= 2 x 3.14 x r
20 = 2 r
r = 10
L lingkaran
L = π r pangkat 2
= 3.14 x 10 pangkat 2
= 3.14 x 100
hasilnya adalah 314 cm
Dit: l lingkaran?
K lingkaran=2πr
=2×3,14×r=62,8
= r=62,8 ÷ 6,28
= r=10
L lingkaran= πr2
=3,14 ×10×10
=3,14×100
=314