Question

A conical tent is 15m high and the radius of its base is 20m. The cost of the Canvas required to make the tent at the rate of ₹ 7 per m² is: ji it up​

Answer 1

Solution :-

Given,

• the conical tent is 15 metre high
• the radius of the base is 20 m .

To find ,

• we need to find here the cost of Canvas required to make the tent .

So,

let the slant height be L.

then ,

${l}^{2} = {r}^{2} + {h}^{2}$

${l}^{2} = {20}^{2} + {15}^{2}$

$= > {l}^{2} = 400 + 225$

$= > {l}^{2} = 625$

$= > l = \sqrt{625}$

$= > l \: = 25m$

So, the slant height of a tent is 25 m .

Now,

C S A of tent = πrl

$csa \: of \: tent = \bold{ \frac{22}{7} \times 20 \times 25}$

$csa \: of \: tent \: = \frac{11000}{7}$

Hence ,

the cost of Canvas ;

$= \frac{11000}{7} \times 7$

$= \frac{11000}{ \cancel 7} \times \cancel{7}$

$= rs.11000$

The cost of Canvas is ₹11000 .