Question

FIND THE TOTAL SURFACE AREA OF THE CONE WHOSE R = R/2 AND HEIGHT = 21
GIVE THE CORRECT ANSWER WITH EXPLAINATION ​

Answer 1

Answer:

πr(l+r/4)

Step-by-step explanation:

We know, the total surface area of cone=πr(r+l).

Given, radius = r/2

and slant height =2l.

Therefore, the new total surface area of cone =π× r/2 (r/2+21)

=π( r^2/4+rl)

=πr(l+ r/4)