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2014-06-05T19:23:51+07:00
Luas= πr²
154=22/7 r²
r²= 154x 7/22
r²= 49
r= 7

kll= 2πr
kll=2.22/7.7
kll=44cm²
1 5 1
2014-06-05T19:40:06+07:00
K=2.π.r
154 = 2.22/7.r
154= 44/7.r
r = 154.7/44
r= 24.5