Question

ESERCISE 13.6
22
Assume =
unless stated otherwise,
7.
1. The circumference of the base of a cylindrical vessel is 132 cm and its height is 25 cm.
How many litres of water can it hold? (1000 cm' = 11).
2. The inner diameter of a cylindrical wooden pipe is 24 cm and its outer diameter is
28 cm. The length of the pipe is 35 cm. Find the mass of the pipe, if I cm' of wood has
a mass of 0.6 g
3. A soft drink is available in two packs - (i) a tin can with a rectangular base of length
5 cm and width 4 cm, having a height of 15 cm and (ii) a plastic cylinder with circular
base of diameter 7 cm and height 10 cm. Which container has greater capacity and by
how much?
4. If the lateral surface of a cylinder is 94.2 cm and its height is 5 cm. then find
(1) radius of its base (ii) its volume. (Use Ti = 3.14)​

Answer 1

Answer:

Step-by-step explanation:

and height (h) = 65 cm = 65100 m = 0.65 m

NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes Ex 13.1 Q1

∵ It is open from the top.

∴ Its surface area

= [Lateral surface area] + [Base area]

= [2(1 + b)h] + [lb]

= [2(1.50 + 1.25)0.65] m2 + [1.50 x 1.25] m2

= [2 x 2.75 x 0.65] m2 + [1.875] m2

= 3.575 m2+ 1.875 m2 = 5.45 m2

∴ Area of the sheet required for making the box = 5.45 m2