The perimeter is equal to Pi times the diameter.
Perimeter = diameter x pi. Area = pi x radius2. (The radius is half the diameter.)
The largest diameter you can inscribe in a circle is a square. The square's diagonal is equal to the diameter of the circle; the length of the side of the square is therefore equal to the circle's diameter, divided by the square root of 2.
The perimeter or circumference of a circle = diameter times pi
The perimeter is the diameter times pi. So the perimeter is 20pi ft
The perimeter of the sun would be calculated as the perimeter (circumference) of a circle which is derived by multiplying 'pi' (3.14) by the diameter. The Sun's diameter is 1.4 million kilometers. Therefore, the circumference of the sun is 3.14 multiplied by 1.4 million which is equal to 4.396 million km.
The side of the square is equal to the diameter of the circle, in this case 2a so the perimeter is 8a cm.
The perimeter of a circle is equal to pi times the diameter, so for a circle with a diameter of 14 cm, multiply by pi, which is approximately 3.14, and you get 43.96 cm, which for most purposes you could round off to 44 cm.
The perimeter of a full circle (circumference) is "pi" times the diameter. So the perimeter of a semi-circle will be half that; Perimeter = (pi/2) x (diameter).
Perimeter = pi*diameter = 113.1 cm
You get 2 circles of diameter. If you were trying to find a perimeter, Never double the diameter. If you have a radius, You have to double it to get a perimeter.
The circumference is the perimeter = 2.0096 The diameter is 2.0096 / Pi = 0.63968 (rounded)