Advertisements
Advertisements
प्रश्न
A cuboidal tin box opened at the top has dimensions 20 cm × 16 cm × 14 cm. What is the total area of metal sheet required to make 10 such boxes?
Advertisements
उत्तर
Dimensions of cuboidal tin box are 20 cm × 16 cm × 14 cm,
∴ Area of metal sheet for 1 box = Surface area of cuboid
= 2(lb + bh + hl)
= 2(20 × 16 + 16 × 14 + 14 × 20)
= 2(320 + 224 + 280)
= 2(824)
= 1648 cm2
∴ Area of metal sheet required to make 10 such boxes = 10 × 1648 = 16480 cm2
APPEARS IN
संबंधित प्रश्न
How many wooden cubical blocks of side 25 cm can be cut from a log of wood of size 3 m by 75 cm by 50 cm, assuming that there is no wastage?
A cuboidal block of silver is 9 cm long, 4 cm broad and 3.5 cm in height. From it, beads of volume 1.5 cm3 each are to be made. Find the number of beads that can be made from the block.
Find the volume in cubic metre (cu. m) of the cuboid whose dimensions islength = 4 m, breadth = 2.5 m, height = 50 cm.
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?
Find the surface area of a cuboid whose length = 10 cm, breadth = 12 cm, height = 14 cm.
The areas of three adjacent faces of a cuboid are x, y and z. If the volume is V, prove that V2 = xyz.
The surface area of a cuboid is 1300 cm2. If its breadth is 10 cm and height is 20 cm2, find its length.
The dining-hall of a hotel is 75 m long; 60 m broad and 16 m high. It has five – doors 4 m by 3 m each and four windows 3 m by 1.6 m each. Find the cost of :
(i) papering its walls at the rate of Rs.12 per m2;
(ii) carpetting its floor at the rate of Rs.25 per m2.
Find the height of the cylinder whose radius is 7 cm and the total surface area is 1100 cm2.
If radii of two cylinders are in the ratio 4 : 3 and their heights are in the ratio 5: 6, find the ratio of their curved surfaces.
