Advertisements
Advertisements
प्रश्न
The length of a hall is 18 m and the width 12 m. The sum of the areas of the floor and the
flat roof is equal to the sum of the areas of the four walls. Find the height of the hall.
Advertisements
उत्तर
Length of the hall = 18m
Width of hall = 12m
Now given,
Area of the floor and the flat roof = sum of the areas of four walls.
`⇒2lb=2lh+2bh`
`⇒lb= lh+bh`
`⇒h=(lb)/(l+b)=(18xx12)/(18+12)=(216)/30`
`=7.2m`
APPEARS IN
संबंधित प्रश्न
Find the ratio of the total surface area and lateral surface area of a cube.
How many planks each of which is 3 m long, 15 cm broad and 5 cm thick can be prepared from a wooden block 6 m long, 75 cm broad and 45 cm thick?
If V is the volume of a cuboid of dimensions a, b, c and S is its surface area, then prove that \[\frac{1}{V} = \frac{2}{S}\left( \frac{1}{a} + \frac{1}{b} + \frac{1}{c} \right)\]
The areas of three adjacent faces of a cuboid are x, y and z. If the volume is V, prove that V2 = xyz.
Three equal cubes are placed adjacently in a row. The ratio of the total surface area of the resulting cuboid to that of the sum of the surface areas of three cubes, is
A cube whose volume is 1/8 cubic centimeter is placed on top of a cube whose volume is 1 cm3. The two cubes are then placed on top of a third cube whose volume is 8 cm3. The height of the stacked cubes is
A wall 9 m long, 6 m high and 20 cm thick, is to be constructed using bricks of dimensions 30 cm, 15 cm, and 10 cm. How many bricks will be required?
The height of a circular cylinder is 20 cm and the diameter of its base is 14 cm. Find:
(i) the volume
(ii) the total surface area.
The external dimensions of an open wooden box are 65 cm, 34 cm, and 25 cm. If the box is made up of wood 2 cm thick, find the capacity of the box and the volume of wood used to make it.
Two cuboids with equal volumes will always have equal surface areas.
