Hi there!
You are partially correct on the π symbol, but there's more!
The formula for finding the area of a circle is:
A = π r².
A stands for area, π stands for pi, and r stands for radius. The ² is there because the radius is half as big as the diameter of a circle.
Hope this helps! :D
And remember, you can message me whenever you need to on anything you may need help with!