Question

Plzz solve Q- 74 .......

Answer 1

Solution:-

Let the slant height of the cone be 'l' meters.

height = 24 m and diameter = 14 m or radius = 7 m. 

Then according to the question.

l² = h² + r²

l² = 24² + 7²

l² = 576 + 49 

l² = 625

l = √625

l = 25 m

So, the slant height of the cone is 25 m.

Now, 

Curved Surface Area of the cone = πrl

= 22/7*7*25

CSA = 550 sq m

Now, length of the cloth used = Area/ width of the cloth

= 550/5

Length of the cloth used = 110 m 

Cost of cloth = Rs. 25 per meter

Total cost of clothe used = 110*25

= Rs. 2750

Answer.

Answer 2

∴ slant height, l = √(r2 + h2) = √(49 + 576) = √625 = 25 m

CSA of the cone = πrl = (22/7) x 7 x 25 = 550 m2

Area of the cloth used = 550 m2

given, width of the cloth = 5 m

Length of the cloth used = Area/Width = 550 / 5 = 110 m.

Total cost, at the rate of ₹25/m = length×price =110×25 = ₹2750.