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15400 x 7/22 = r²
4900 = r²
r = √4900
r = 70 cm
Keliling = 22/7 x 2 x r
= 22/7 x 2 x 70
=440 (D)
15.400 = 22/7x r²
15400 : 22/7 = r²
15400 x 7/22 = r ²
4900 = r²
√4900 =r
70 =r
jadi keliling lingkaran adalah
=2πr
=2 x 22/7 x 70
= 440 cm
semoga membantu
good luck :)