Question

5. Find the total surce area of a come, fiis slant height is 21 cm and the diameter of its base is 24​

Answer 1

Answer:

Tsa of cone : πr(l+r)

Step-by-step explanation:

given- l = 21 CM

D=24 CM

r= 12 CM

to find TSA put values in the formula

πr(l+r)

22/7 (21+12)

22/7 (9)

198/7

TSA = 28.28 cm square

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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=

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

Step-by-step explanation:

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