Question

If slant height of the cone is 21cm and diameter of base is 24 cm. The total surface area of cone is:

a. 1200.77 sq.cm

b. 1177 sq.cm

c. 1222.77 sq.cm

d. 1244.57 sq.cm
​

Answer 1

Answer:

option d is correct one

Answer 2

Step-by-step explanation:

Given,

Slant height of cone is l=21 m.

Diameter of its base is d=24 m.

hence, radius of its base is r=

2

d

=12 m.

Now, the total surface area of cone is given by

S=πrl+πr

2

S=π(rl+r

2

)

S=π(12×21+12

2

)

S=π(252+144)

S=

7

22

×396

hence, S=1244.57 m

2