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154=22/7×r²
r²= 154×7/22
r²= 7×7
r²=49
r=√49
=7 cm
jadi jari jarinya 7cm
k=2Πr
= 2×22/7×7
=44cm
jadi kelilingnya 44cm
L lingkaran = πr²
154 = 22/7 r²
r² = 154 x 7/22 = 49
r = √49 = 7 cm
K lingkaran = πd
= 22/7 x 14
= 44 cm