There is a rectangle with a square bottom area and a height of 36cm. When the side is expanded, it is just a square. How many cubic centimeters is the volume of this rectangle

There is a rectangle with a square bottom area and a height of 36cm. When the side is expanded, it is just a square. How many cubic centimeters is the volume of this rectangle

Bottom circumference = 36 cm
therefore
Side length = 36 △ 4 = 9cm
therefore
Volume = 9 × 9 × 36 = 2916 CC