Radius of a circle= Perimeter of the circle/2*pi
Radius is half the diameter
Radius is the length of a straight line from the center point of the circle to the edge of the circle.
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The circumference of a circle is equal to 2 x pi x radius, where "pi" is approximately 3.1416.
The radius is equal to 1/2 the diameter. 11 divided by 2 =5.5
The area (A) of a circle is A = π . r2 The diameter (D) is equal to D = r / 2 . Were r is the radius. If the diameter of the circle is 45 mm, and we divide it by 2. We will obtain the radius which is equal to 22,5mm: D = 45mm / 2 = 22,5mm If we square this radius the result is 506,25mm2: r2 = (22,5mm)2 = 506,25mm2 So the area of the circle of diameter 45mm is: A = 506,25mm2 . π = 1590,43mm2d
The circumference of a circle is calculated using the formula C = 2πr, where C is the circumference, π is a constant approximately equal to 3.14159, and r is the radius of the circle. Given a radius of 20, the circumference would be C = 2 * 3.14159 * 20 = 125.6636 units.
Approximately 50.26m, because circumference is equal to diameter times pi (or 3.1415). Or twice the radius times pi.