Question

13. The radius of a solid right circular cylinder
decreases by 20% and its height increases by
10%. Find the percentage change in its :
(1) volume (ii) curved surface area
14. Find the minimum length in cm and correct to
nearest whole number of the thin metal sheet
required to make a hollow and closed cylindrical
box of diameter 20 cm and height 35 cm.
Given that the width of the metal sheet is 1 m.
Also, find the cost of the sheet at the rate of
56 per m.
Find the area of metal sheet required, if 10% of it
is wasted in cutting, overlapping, etc,
15. 3080 cm3 of wato
cylind.
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Answer 1

Answer:

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