Examples with solutions for Surface Area of a Cuboid: Subtraction or addition to a larger shape

Exercise #1

A number of bricks were stacked in the shape of a box. One brick was pulled out so that a brick-sized recess was left on its side.

Calculate the surface area of ​​the new shape.

3x5.57x21.5

Video Solution

Answer

79x + 83 cm²

Exercise #2

Calculate the surface area of the shape in the diagram below.

444777131313

Video Solution

Answer

342 cm2

Exercise #3

To each wig of the box a cube was attached, with a side length of 3 cm.

Find the area of the surface of the shape:

444777888

Video Solution

Answer

448cm2 448\operatorname{cm}^2

Exercise #4

An cuboid with a square hole is shown below.

Calculate the surface area of the shape.

2.5945

Video Solution

Answer

279.5 cm².