Question

A plastic box 5m long,4 m wide and 3 m deep,is to be made.Ignoring the thickness of the plastic sheet, determine the area of the sheet required for making the box​

Answer 1

Answer:

Given: A plastic box 1.5 m long, 1.25 m wide and 65 cm deep. It is opened at the top. The cost of 1 m² sheet is ₹20.

To find: Area of the sheet required for making the box and its cost.

Since the box is opened at the top, it has only 5 surfaces, including the 4 walls and the base. The area of the sheet required for making the cuboidal box includes the 4 walls of the box and the base.

Hence, the area of the sheet can be obtained by adding the area of the base to the lateral surface area of the cuboidal box.

Lateral surface area of cuboid = 2(l + b)h