Question

1. If a side or edge of a cube is 3 metre find its total surface area.

2. The Length breadth and height of a cuboid are 8m, 6 metre and 4 metre find the area of the

four walls of room.

3. The Length breadth and height of a room are 5 metre 4 and 3 find the cost of whitewashing

the walls of the room and the ceiling at the rate of Rs 7.50 per metre square

4. A cubical box has each edge 10cm and another cuboidal box is 12.5 cm long 10cm wide and

8cm high

1. Which box has greater lateral surface area and by how much

2. Which box has the smaller total surface area and by how much.

5. A solid cube is cut into two cuboids of equal volumes find the ratio of the total surface area

of the given cube and that of one of the cuboids

6. 125 person can sleep in a room of dimensions 25 metre by 9.8 metre if each person requires

12.25 metre cube of air find the height of the room.

7. The capacity of a cuboidal tank is 50000 litres of water find the breadth of the tank if its

length and depth are respectively 2.5 metre and 10 metre

8. . Find the lateral surface area of a cuboid whose length is 70 cm and breadth is 30 cm and

height is 20 CM

9. Radius of the base of cylinder is 14 cm and height 30 cm find its curved surface area and

total surface area and volume.

10. If the radius of a cylinder is doubled and its curved surface area is not change the height

must be halved prove

11. A metal pipe is 77cm long the inner diameter of a cross section is 4 cm the outer diameter

being 4.4 find its inner curved surface area outer surface area and total surface area

12. Diameter of the base of a cone is 10.5 CM its slant height is 10 cm find the curved surface

area.

13. Find the total surface area of cone if its slant height is 21 metre and diameter of its base is

24 metre

14. How many square metre of Canvas is required for a conical 10 whose height is 3.5 metre and

radius of the base is 12 metre

15. What length of tarpaulin 3M wide will be required to make a conical tent of height 8 and

base radius 6 metre assume that extra length of material that will be required for stitching

margins and wastage in cutting is approximately 20 CM use Pi is equal to 3.14

16. Find the surface area of a sphere of radius 7cm

17. Find the curved surface area and the total surface area of the hemisphere of radius 21 CM

18. Hemispherical bowl of brass have in a diameter of 10.5 cm find the cost of tin plating it on

the inside at the rate of rupees 16 for 100 cm square

19. 27 solid iron sphere each of radius r and surface area S are melted to form a square with

surface area as one find the radius r1 of the new sphere ratio of S and s1

20. A cone ,a hemisphere and a cylinder stand on equal bases and have the same height find the

ratio of their volumes​

Answer 1

Step-by-step explanation:

Answer 2

Answer:

2 no answer is 18 m is the area of the four wall room