Question

find the total surface are of cone if its

slant height is 28 m and diameter of base is
24 m. ​

Answer 1

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=2d=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=722×396

hence, S=1244.57 m2