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Circumference - Wikipedia
Why circumference of circle is two pi r or pi d - YouTube
P Pi D Pi Bonds Important Concepts and Tips for JEE
The formula for the area A of a circle with diamete d is A=\pi(\frac{d}{2})^ 2. Write an expression to represent the area of the circle. | Homework.Study.com
Area of a Circle calculator
Area of a Circle
873 Math (2010): Emily's Circle Surface Area Scribe Post