So: the baking pan is a cylinder so you need the equation which gives you the volume of a cylinder. This is the area of the base of the cylinder multiplied by the height of the cylinder.
The base is a circle and you know the radius. The area of a circle is radius^2pi.
Therefore: 6^2 3.14 = 113.04
Now, you know the volume of the batter which is poured into the pan: 550 cm^3. You know the area of the base of the cylinder: 113.04. You only need the height, which you can calculate.
550 = 113.04 * height
Divide by 113.04
4.9 = height.
