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l=πr²
154=22/7.r²
154. 7/22 =r²
484=r²
22=r
k=2πr
2.22/7.22
138,28
maaf kalau salah hitung dsb:)
154 = 22/7 r2 => r2 = (154 x 7) / 22
= 49
r = √49 = 7cm
maka keliling = 22/7 x 7 x 2 = 44 cm