bantuin jawab please luas lingkaran 154 cm2, keliling lingkaran adlah

L = phi x r^2
154 = 22/7 x r^2
22 r^2 = 154 x 7
22 r^2 = 1078
r^2 = 1078/22
r^2 = 49
r = 7

maka kelilingnya
K = 2 x phi x r
K = 2 x 22/7 x 7
K = 44 cm