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Q : 8  Parveen wanted to make a temporary shelter for her car, by making a box-like structure with tarpaulin that covers all the four sides and the top of the car (with the front face as a flap which can be rolled up). Assuming that the stitching margins are very small, and therefore negligible, how much tarpaulin would be required to make the shelter of height , with base dimensions ?

Given, Dimensions of the tarpaulin =  The required amount of tarpaulin = Lateral surface area of the shelter + Area of top = Required Therefore,  tarpaulin is required.

Q : 7       Shanti Sweets Stall was placing an order for making cardboard boxes for packing their sweets. Two sizes of boxes were required. The bigger of dimensions , and the smaller of dimensions . For all the overlaps, of the total surface area is required extra. If the cost of the cardboard is Rs 4 for ,  find the cost of cardboard required for supplying 250 boxes of each kind.

Given, Dimensions of the bigger box = , Dimensions of smaller box =   We know, Total surface area of a cuboid =   Total surface area of the bigger box =   Area of the overlap for the bigger box =  Similarly,   Total surface area of the smaller box =   Area of the overlap for the smaller box =  Since, 250 of each box is required,  Total area of carboard required =  Cost of  of the cardboard...

Q : 6     A small indoor greenhouse (herbarium) is made entirely of glass panes (including base) held together with tape. It is 30 cm long, 25 cm wide and 25 cm high.

(ii) How much of tape is needed for all the 12 edges?

Given, dimensions of the greenhouse =  (ii) Tape needed for all the 12 edges = Perimeter = Therefore,  of tape is needed for the edges.

Q : 6    A small indoor greenhouse (herbarium) is made entirely of glass panes (including
base) held together with tape. It is long, wide and high.

(i) What is the area of the glass?

Given, dimensions of the greenhouse =  Area of the glass =  Therefore, the area of glass is

Q : 5        A cubical box has each edge and another cuboidal box is long, wide and high.

(ii) Which box has the smaller total surface area and by how much?

Given, Edge of the cubical box =  Dimensions of the cuboid =  (ii) The total surface area of the cubical box =  The total surface area of the cuboidal box =  Clearly, the total surface area of a cuboidal box is greater than the cubical box. Difference between them =

Q : 5      A cubical box has each edge and another cuboidal box is long,  wide and high.

(i) Which box has the greater lateral surface area and by how much?

Given, Edge of the cubical box =  Dimensions of the cuboid =  The lateral surface area of the cubical box =  The lateral surface area of the cuboidal box =  Clearly, Lateral surface area of the cubical box is greater than the cuboidal box. Difference between them =

Q : 4     The paint in a certain container is sufficient to paint an area equal to .  How many bricks of dimensions can be painted out of this container?

Given, dimensions of the brick =  We know, Surface area of a cuboid =  The surface area of a single brick =   Number of bricks that can be painted =  Therefore, the required number of bricks that can be painted = 100

Q : 3        The floor of a rectangular hall has a perimeter . If the cost of painting the four walls at the rate of Rs 10 per  is Rs 15000, find the height of the hall.

[Hint : Area of the four walls Lateral surface area.]

Given, Perimeter of rectangular hall =  Cost of painting the four walls at the rate of Rs 10 per  = Rs 15000 Let the height of the wall be   Area to be painted =  Required cost =  Therefore, the height of the hall is

Q : 2      The length, breadth and height of a room are , and respectively. Find the cost of white washing the walls of the room and the ceiling at the rate of    per .

Given, Dimensions of the room =  Required area to be whitewashed = Area of the walls + Area of the ceiling =  Cost of white-washing per  area = Cost of white-washing area = Therefore, the required cost of whitewashing the walls of the room and the ceiling is

Q : 1       A plastic box long, wide and deep is to be made. It is opened at the top. Ignoring the thickness of the plastic sheet, determine:

(ii) The cost of sheet for it, if a sheet measuring   costs Rs 20.

Given, dimensions of the plastic box Length,  Width,  Depth,  We know, area of the sheet required for making the box is  (ii) Cost for   of sheet = Rs 20  Cost for  of sheet =  Required cost of the sheet is

Q : 1       A plastic box long, wide and deep is to be made. It is opened at the top. Ignoring the thickness of the plastic sheet, determine:

(i) The area of the sheet required for making the box.

Given, dimensions of the plastic box Length,  Width,  Depth,  (i) The area of the sheet required for making the box (open at the top)= Lateral surface area of the box. + Area of the base.   =  The required area of the sheet required for making the box is
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