Can anyone help me to find the answer..... please...
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Answer:
Curved Surface Area of Cone =
Total surface area of cone = π r ( r + l )
Given data,
radius of cone= r/2
slant height = 2l
Therefore, total surface area of cone =π r/2 (r/2 + 2l)
= π( r^2 / 4 + rl )
=π r ( l + r/4 )