To find the volume of a rectangular box, we will need to use the formula:
Volume = Length * Width * Height
Here, the length of the box is given as 11 cm, the width is also 11 cm, and the height is 15 cm.
First, we start by multiplying the length and width together.
So, 11 cm (length) * 11 cm (width) = 121 sq.cm.
The resulting product, 121 sq.cm, represents the area of the base of the box.
To find the volume, we then multiply this area by the height of the box.
So, 121 sq.cm (base area) * 15 cm (height) = 1815 cubic cm.
So, the volume of the box is 1815 cubic cm.