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2009-11-09T19:08:00+01:00
A) P=90*12²π/360=90*144π/360=36π
l=90*2*12π/360=6π

b) P=60*15²π/360=37.5π
l=60*2*15π/360=5π

c) P=135*20²π/360=150π
l=135*2*20π/360=15π

d) P=120*12²π/360=48π
l=120*2*12π/360=8π

e) P=200*15²π/360=125π
l=200*2*15π/360=16.67π
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