Let Us Practise 15.1.
- A child needs to cover a die with coloured paper from all the sides. Find the cost of covering the di
whose edge is 14 mm, given that cost of paper is 2 per mm.
- The length, breadth and height of a hall are 12 50 m. 10 m and 6 m respectively. Find the cost of paintine
me walls at 20 per m. Also find the cost of painting if the ceiling is also painted aceauve wa
costing *24 per m².
Find the edge of a cube whose surface area is 2400 cm?.
The paint in a container is sufficient to paint 7.2 m2 surface. How many containers of paint
wu de required to paint walls of a room with dimensions 3.2 m x 2.8 mx 2.4 m. Find me
cost of paint, if each container costs 460.
HOTS
A closed cylindrical tank of diameter 14 m and height 5 m is made from a metal sheet. How much met
sheet will be required?
A road roller takes 750 complete revolutions to move once over to level a road. Find the area of the roa
the diameter of the road roller is 84 cm and length is 1 m.
our times the area of the curved surface of a cylinder is equal to 6 times the sum of the areas of its bas
its height is 12 cm, find its curved surface area.
INCERT Exemp
cuboid has lateral surface area 152 cm² and total surface area 280 cm. Find the area of its top and
st of painting the top at the rate of 18 per cm?.
cylinder has radius 4.2 cm and height 30 cm. Find the surface area of the cylinder, if it is
Open at both ends
(ii) Closed at one end (iii) Closed at both ends.
ta for the
Answers
Answered by
2
1) TSA (die) =
Cost = 1,176 * 2 = 2,352
2) LSA (room) = 2h(l+b)
= 2 * 6 (12.5 + 10)
= 12 * 22.5
= 270
Cost = 20 * 270
= 540
TSA (open cuboid) = LSA + lb
= 270 + 12.5 * 10
= 270 + 125
= 395
Cost = 395 * 24
=9,480
Answered by
0
Step-by-step explanation:
The answer are as follows :-
1) Rupees 2352
2)rupees 5400, rupees 8400
3)20 cm
4) 4, rupees 1840
5) 528 m^2
6) 1980m^2
7) r=8cm, A = 603.428cm square
8) 64 cm^2, rupees 1152
9) (I) 792cm square
(II) 847.44 CM square
(III) 902.88cm square
All answer are correct
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