[" 3.) If "p,q" and "r" are in "AP" ,the...

[" 3.) If "p,q" and "r" are in "AP" ,then prove that "(p+2q-r)(2q+r^(2)-p)(r+p^(3)-q)=4pqr],[" 4.A semi-circular sheet of metal of diameter "28cm" is bent into an open conical cup."],[" Find the depth and capacity of the cup."]

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