Question 795758
From a cylindrical object of diameter 70cm and height 84cm , a right solid cone having its base as one of the circular ends of the cylinder and height 84cm is removed.  
Calculate :
A) the volume of the remaning solid object , expressing your answer in the form a X 10n (10 raised to power n) where 1<a<10 and n is a positive integer
Vol of the cylinder = {{{pi*r^2*h}}}
Vol of the cone = {{{pi*r^2*h/3}}}
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B) the surface area of the remaining solid object
The area of one end is {{{pi*r^2}}}
The lateral area = {{{pi*d*h}}}
The inner surface = the lateral area of the cone
Slant height = {{{sqrt(84^2 + 35^2) = 91}}} cm
Area = pi*r*SH