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616cm2 adalah luas lingkaran yang jari jarinya 14cm
cara: 154:22/7 = √49 = 7cm
keliling : πxD = 22/7 x 14cm = 44cm
keliling lingkaran 2πr
luas lingkaran 154 =22/7 x r²
154 x 7/22 =r²
49 = r²
√49 = r
7 = 4
kelilingnya 2πr= 2 x 22/7 x 7
= 44