Question

Which of the following option is correct?

S1 : Total surface area of a cuboid is the sum of areas of 4 faces excluding top and bottom faces.

S2 : Lateral surface area of a cuboid is the sum of areas of 4 faces excluding top and bottom faces.

S3 : Area of a face of a cuboid is of the form xy, where x and y are length and breadth respectively.

• A. S1 , S3 are true
• B. S2 , S3 are false
• C. S1 and S3 are false
• D. S2 and S3 are true

Answer 1

The correct option is D

S2 and S3 are true

A cuboid has 6 faces – 1 at the top, 4 at the side, 1 at the bottom.

Total surface area is defined as the sum of the areas of all 6 faces.

Lateral surface area is defined as the sum of areas of 4 faces which excludes the area of the top and bottom faces.

Area of a face of a cuboid = lb

Where l is the length of that face of the cuboid, b is the breadth of that face of the cuboid