Question

11
5. A conical pit of top lamel
6. The volume of a right circular cone is 9856 cm . If the diameter of the base is 28 cm,
find
(i) height of the cone
(ii) slant height of the cone
(iii) curved surface area of the cone
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Answer 1

Answer:

Given:

r=

2

28

=14cm

(i)Let height =h

⇒Volume =9856=

3

1

πr

2

h

9856=

3

1

×

7

22

×14×14×h

⇒h=48cm

(ii)⇒Slant height =

r

2

+h

2

=

14

2

+48

2

=

196+2340

=50cm

(iii)⇒Curved Surface Area =πrl=

7

22

×14×50cm

2

=22004cm

2