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r²=L:π
r²=314 : 3,14
r²=100
r=√100
r=10 cm
K=2πr
K=2×3,14×10
K=62,8 cm
Jadi Keliling nya 62,8 cm
314 cm²= 3,14 × r²
r²= 314÷3,14
= 100
r = 10 cm
Keliling lingkaran: 2πr
2 × 3,14 × 10 = 62,8 cm