Question

Cost of the blue colour paper required , if cost of 10 cm is Rs 12.
(i) Rs 105.6
(ii) Rs 1056
(iii)Rs 10.56
(iv) Rs 1.056​

Answer 1

Answer:

(i) rs 105.6

the answer is this

Answer 2

Given:

The cost of 10 cm² is Rs 12.

To find:

The cost of the blue colour paper required

Solution:

From the given figure, we have

The height of the conical part of the model, h = 3 cm

The diameter of the base = 14 cm

∴ The radius of the base, r = $\frac{d}{2} = \frac{14}{2} = 7 \:cm$

∴ The slant height of the cone, $l = \sqrt{h^2 + r^2} = \sqrt{3^2 + 7^2} = \sqrt{9 + 49} = \sqrt{58} \:cm$

Blue colour paper is used to cover the conical surface of the rocket model, so we have to find the curved surface area of the conical part to get the area of the blue colour paper used.

Therefore,

The required area of the blue colour paper used to cover the conical portion of the rocket is,

= Curved surface area of a cone

= $\pi r l$

= $\frac{22}{7} \times 7 \times \sqrt{58}$

= $22\times \sqrt{58}$

= $\bold{167.54 \:cm^2}$

Now,

If the cost of 10 cm² of blue paper is Rs. 12

The cost of 1 cm² of blue paper = $\frac{12}{10} = Rs. 1.2$

Then,

The cost of 167.54 cm² of blue paper is,

= Rs. 1.2/cm² × 167.54 cm²

≈ Rs. 201

Thus, the cost of the blue colour paper required to cover the conical part of the model is → Rs. 201.

------------------------------------------------------------------------------------------------------

Also View:

Area of the yellow colour paper required to cover the portion of the rocket.(use pie =22/7)

brainly.in/question/37552927

Some poor children use recycled paper to make conical party caps with a radius of 7cm and slant height of 15 cm and sell it on a street stall.

(a)How much would they earn profit by selling 50 caps? the selling price of the cap is 50paise per cm square?

(b)Which value is depicted by the children?

brainly.in/question/2666415

a wooden toy rocket is in the shape of a cone mounted on a cylinder. The height of the entire rocket is 26 cm, while the height of the conical is 6 CM, the base of the conical portion has a diameter of 5 cm, while the base diameter of the cylinder portion is 3 cm conical portion is to be painted orange and cylindrical pots and yellow, find the area of the rocket painted with each of this colours (use pie 3.14 )​

brainly.in/question/14022509