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L = 314
MAKA :
L = π X r²
314 = 3,14 x r²
r² = 100
r = 10
jadi Keliling = 2 x π x r
= 2 x 3,14 x 10
= 62,8 cm
L = phi x rkuadrat
314=3,14 x rkuadrat
314/3,14 = rkuadrat
100= rkuadrat
r=√100=10 cm
Keliling = 2 x phi x r
=2 x 3,14 x 10 = 62,8 cm