Q. 64.2( 177 Votes )
Describe how the two figures at the right are alike and how they are different. Which box has larger lateral surface area?

Answer :
The figure is shown:
Similarity: Their dimensions are equal, i.e. 7 cm width, breadth and height
Difference: The figure on the left is cylindrical and that on the right is cuboidal.
So, surface area of cylinder = 2 π rh = 2 × × 7
= 154 sq. cm
And surface area of the cube = 4 × side2
= 4 × 72
= 196 sq. cm
Clearly, the cube has a larger surface area than the cylinder.
Rate this question :






















If the height of a cylinder becomes of the original height and the radius is doubled, then which of the following will be true?
The ratio between the curved surface area and the total surface area of a right circular cylinder is 1 : 2. Prove that its height and radius are equal.
RD Sharma - MathematicsA rectangular water reservoir contains 105 m3 of water. Find the depth of the water in the reservoir if its base measures 12 m by 3.5 m.
RD Sharma - MathematicsThree equal cubes are placedadjacently in a row. Find the ratio of total surface area of the new cuboid to that of the sum of the surface areas of the three cubes.
RD Sharma - MathematicsA closed iron tank 12 m long, 9 m wide and 4 m deep is to be made. Determine the cost of iron sheet used at the rate of Rs. 5 per metre sheet, sheet being 2 m wide.
RD Sharma - MathematicsThe breadth of a room is twice its height, one half of its length and the volume of the room is 512 cu. Dm. Find its dimensions.
RD Sharma - MathematicsFind the cost of sinking a tube well 280 m deep, having diameter 3 m at the rate of Rs. 3.60 per cubic metre. Find also the cost of cementing its inner curved surface at Rs. 2.50 per square metre.
RD Sharma - MathematicsThe 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 wall.
RD Sharma - Mathematics