Question

Find the total surface area of cone if it slant height is 21 cm diameter of its space 24 cm​

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=

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

Answer 2

Answer:

Step-by-step explanation:

Total surface area (T.S.A) = πrl+πr²

diameter = 24

radius. 24/2=12.

Total Surface area of cone= π (12)(21)+π(12)²

=π(252)+π(144)

=396π (use 3.14 for π)

=396x3.14

=1243.44