Respuesta :

olemakpadu
Total surface area of cone:  πrl + πr²

Assuming the bottom of the cone is closed.

r = r/2,  l = 2l

Total surface Area =  π*(r/2)*2l + π(r/2)²  =  πrl + πr²/4

Total Surface Area = πrl + πr²/4

Hope you could understand.

If you have any query, feel free to ask

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