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2014-06-03T10:50:59+03:00


L=2πr

24π=2πr

r=24π/2π

r=12

A=πr²

A=12²π

A=144π

2 5 2
2014-06-03T10:51:06+03:00
Lc=24π
Lc=2πR

2πR=24π
2R=24
R=12

A=πR²= 12²π= 144π