Question

Q-3 (c)
Find the Height if Radius = 5 cm, Total surface area = 120π cm² ( π = 22/7 )​

Answer 1

Step-by-step explanation:

The curved surface area of a cone =πrl, where r is the radius and l is slant height.

Given, r=5cm and h=12cm.

We need to calculate slant height, using the formula l

2

=r

2

+h

2

, where h is height.

So, l

=

r

2

+h

2

=

5

2

+12

2

=13.

We know,

curved surface area of a cone =πrl =π×5×13 =65π cm

2

Hence, the answer is 65π cm

2

.

Therefore, option B is correct.