Question

top. Ignoring the thickness of the plastic sheet, determine:
A plastic box 1.5 m long, 1.25 m wide and 65 cm deep is to be made. It is opened at the
The area of the sheet required for making the box.
(ii) The cost of sheet for it, if a sheet measuring Im? costs Rs 20.
​

Answer 1

Answer:

refer below

Step-by-step explanation:

i. total area= (2x1.5x0.65) + (2x1.25x0.65) + (1.5x1.25) =1.95 + 1.625 + 1.875 = 5.45m2

ii. cost = 5.45x20 = 109Rs

Answer 2

Step-by-step explanation:

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9th

Maths

Surface Areas and Volumes

Surface Area of Cubes and Cuboids

A plastic box 1.5 m long, 1...

MATHS

A plastic box 1.5 m long, 1.25 m wide and 65 cm deep is to be made. It is opened at the top. Ignoring the thickness of the plastic sheet,

(i) determine the area of the sheet

(ii) the cost of sheet for it, if a sheet measuring 1 m

2

costs Rs.20.

MEDIUM

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VIDEO EXPLANATION

ANSWER

Given:

Length of box =1.5 m, Breadth =1.25 m, Height =0.65 m

⇒Area to be white-washed = Area of cuboid − Area of base.

(i) Area of sheet requred =2lb+2bh+2lh−lb

(i) Area of sheet requred =2lh+2bh+lb .....[Box is open]

=[2×1.5×0.65+2×1.25×0.65+1.5×1.25] m

2

=(1.95+1.625+1.875)m

2

=5.45 m

2

ii) Cost of sheet per m

2

area = Rs. 20

Cost of sheet of 5.45m

2

area = Rs. 5.45×20

= Rs. 109