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#1 Rocky

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Posted 10 November 2005 - 07:15 PM

I got this Q about 2 adjacents of a bicycle wheel with Centre P
(a) Use the Sine Rule to show that

r powerslash.gif cos(w/2) = p powerslash.gif sin w

(b) Hence show that: p= 2r sin(w/2)




*Well I have got (a) as look:
The diagram shows that the "Angle= (180-w) powerslash.gif 2"
Which cancels down to "sin90-w/2"
So now using Sine Rule:
p powerslash.gif sinw = r powerslash.gif (sin90-w/2)

But I am not getting (b) to work out, so anyone can help me with this part.





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