11/19/2023 0 Comments 21 inch radiua what is the area![]() ![]() If you input the radius in centimeters, you will get the answer in square centimeters (cm²), if in inches, will get the answer in square inches (in²) and so on. 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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