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2014-05-17T17:57:11+03:00


L=2πr

6π=2πr

r=6π/2π

r=3 cm

A=πr²

A=π3²

A=9π

2 5 2
2014-05-17T17:57:15+03:00
Lc=2πR
Lc=6π   ⇒2πR=6π  R=6π/ 2π= 3

Ac=πR²= 3²π=9π
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