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2014-05-11T22:16:06+03:00
D=2R
R=D/2= 10/2=5

Lc=2πR
Lc=2*5π
Lc=10π
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2014-05-11T22:16:18+03:00
L=2πR
R=10/2=5
L=2.5π=10π cm

D=6si2/5=32/5⇒R=16/5
L=2π16/5=π32/5 cm

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