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Question
A right angled triangle of which the sides containing he right angle are 6.3 cm and lo cm in length, is made to turn round on the longer side. Find the volume of the solid, thus generated. Also, find its curved surface area.
Solution
Given, radius of cone (r) = 6.3cm
Height of cone (h) =10 cm
∴ WKT, Slant height l = `sqrt((6.3)^2+(10)^2)`
=` 11.819 cm [l=sqrt(r^2+h^2)]`
∴ Volume of cone = `1/3pir^2h=1/3xx3.14xx(6.3)^2xx10=4158cm^3`
And CSA of cone=`pirl`
= `22/7xx6.3xx11.819=234.01cm^2`
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