![]() For simplicity, you can use Pi = 3.14 or Pi = 3.1415. Π represents the number Pi which is defined as the ratio of the circumference of a circle to its diameter or π = C d. The diameter is twice the radius or d = 2 The diameter of a circle is any straight line segment that passes through the center of the circle and whose endpoints lie on the circle. The radius is half the diameter or r = d 2. The radius of a circle is any of the line segments from its center to its perimeter. See below some definitions related to the formulas: CircumferenceĬircumference is the linear distance around the circle edge.
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