Question

Answer the following.
1. The radius of cone is 7 cm and its slant height is 9 cm. Find its (i) L.S.A (ii) T.S.A (iii) Volume​

Answer 1

Step-by-step explanation:

We know that the radius of cone r=7cm

and its height h=9cm

and the slant height of second cone =t cm

Then, according to the question.

Numerically: The lateral surface of second cone = volume of the first cone

πrl=

3

1

πr

2

h

π×7×l=

3

1

π×7

2

×9

1=

3

1

×

7

7×3×9

=21

Thus the required slant height slant height of the second cone =21cm

Answer 2

Step-by-step explanation:

Answer

r=7cm, l=10cm

C.S.A. of cone =πrl

=

7

22

×7×10

=220 sq.cm.