90
of the cylinder is 20 cm.
metre length, are 3.5 cm. and 4.2 cm. respectively let us write by calculating the volume of the
Application : 11 If the inner and outer radii of a hollow right circular cylindrical pipeois
iron that the pipe contains.
If I cubic decimetre of iron weighs 5 kilogram, let us write by calculating, the weight of the pipe
[Let me do it myself]
heinht is
Answers
Answer:
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Answer:
A plastic box 1.5 m long, 1.25 m wide and 65 cm deep is to be made. It the top. Ignoring the thickness of the plastic sheet, determine: (i) The area of the sheet required .for snaking the box. (ii) The cost of sheet for it, if a sheet measuring 1 m2 costs Rs. 20.Sol: (i) Here, l = 1.5 m, b = 1.25 m ∵ It is open from the top. ∵ Its surface area = [Lateral surface area] + [Base area] = [2(l + b)h] + [l × b] = [2(1.50 + 1.25)0.65 m2] + [1.50 × 1.25 m2] = [2 × 2.75 × 0.65 m2] + [1.875 m2] = 3.575 m2 + 1.875 m2 = 5.45 m2 ∵ The total surface area of the box = 5.45 m2 ∴ Area of the sheet required for making the box = 5.45 m2 (ii) Rate of sheet = Rs. 20 per m2 Cost of 5.45 m2 = Rs. 20 × 5.45 ⇒ Cost of the required sheet = Rs.109
Step-by-step explanation: