Question

surface
2. Find the total surface area of a cone, if its slant height is 21 m and diameter of its
base.
is 24 m.​

Answer 1

Answer:

1. 21*24= you know what it is

Answer 2

Answer:

Given,

Slant height of cone is l=21 m.

Diameter of its base is d=24 m.

hence, radius of its base is r= d/2 =12 m.

Now, the total surface area of cone is given by

S = πrl + πr²

S = π( rl + r²)

S = π( 12 × 21 + 12²)

S = π( 252 + 144)

S = 22/7 × 396

Hence, S=1244.57 m²