In this module, you can study what the area of a circle is and how to find the area of a circle if you know its diameter or radius.
The video above shows you how to calculate the area of a circle if you know either the radius or the diameter.
The above video shows a visual explanation of the area formula. In other words, it shows you WHY the area of a circle equals pi times radius squared.
If a circle and a square have the same perimeter, their areas will be different.
Pi times r-squared means Pi x radius x radius. It does NOT mean Pi x radius x 2.
Study and practice
Use these search terms to find additional resources:
how to find the area of a circle
circle area