Question

A plastic box is 20 cm long, 15 cm wide and 15 cm high. It is opened at the top. Find cost of the sheet required for it, if a sheet
measuring 1 sq m costs Rs 30.-​

Answer 1

Answer:

For the above question, the box is a cuboid with its top open.

Therefore to calculate the area of the open cuboid,we will apply formula of = C.S.A. of cuboid + Base area of cuboid

Curved Surface Area of cuboid = 2(l + b) h

=2(20+15) ×15

= 1050 sq.cm

Base area of cuboid = l × b = 20×15=300 sq.cm

Therefore Area of the open cuboid box = 1050 + 300

=1350sq.cm

Now you can calculate the later part...

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