Question

find the total surface area of cone whose radius is r/2 and length is 21​

Answer 1

Answer:

Total surface area of cone=πr(radius+length)

Given, radius = radius/2 and slant height =2l

and slant height =2l

Therefore new total surface area of cone =

π radius / 2 (r /2 +21 )

= π = ( radius²/2 +rl)

= π radius ( 1 + radius /4)