There is no such thing as the perimeter of a circle. The circumference, however, is 12.4*pi (since the formula is pi*diameter)
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Radius is the shortest distance via straight line between the center point of the circle and its perimeter. Diameter is the greatest distance via straight line from one perimeter of the circle to the opposite perimeter. Diameter = 2x Radius.
Pi= 3.1416 circle / 3.1416=diameter
No, you add up all the sides. Yes, in terms of a circle. To determine the perimeter or circumference of a circle, you must multiply: 2πr or two times Pi times the radius of the circle.
For a given area a circle has least perimeter. eg Let area = 100 sq cms. For the square or rectangle the perimeter = 40 cms For the circle the radius is square root of 100/3.1416 = 5.64 and the circumference = 2 x radius x 3.1416 = 35.44 cms
perimeter_of_quarter_circle = 1/2πr + 2r For the arc bit of the perimeter: circumference of circle = 2 x π x radius quarter of this = 1/2 x π x radius The two straight sides are radii which need to be added on making: perimeter_of_quarter_circle = 1/2 x π x radius + 2 x radius