The radius of a cone is r/2 and length is 21 then its total surface area is
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πr(l+r/4)
Step-by-step explanation:
Total surface area of cone = πr(r+l)
Given, radius =r/2 and slant height =2l
Therefore, new total surface area of cone = π(r/2)(r/2+2l)
=π(r^2+rl)
=πr(l+r/4)
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