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154 = 22/7 . r"
154 : 22/7 = r'
49 = r"
r = akar 49
r = 7
jadi kel = 2.22/7.7
= 44
154 = 22/7 x r2
49 = r2
maka r = 7cm
sehingga d = 14cm
K = phi x d
= 22/7 x 14
= 44 cm