Perimeter = pi*diameter = 113.1 cm
Perimeter = pi*d = 37.699 cm
perimeter of a circle = circumference = pi x diameter perimeter = 3.1416 x 12 = 37.7 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.
Pi= 3.1416 circle / 3.1416=diameter
radius 5 cm diameter 10 cm
10 cm; the diameter of a circle is twice its radius.
half times pi times 10....
The area of a circle whose diameter is 10 cm is: 78.54 cm2
the radius of a circle is half of its diameter.
The radius measures from the center of the circle to the perimeter (outside), so if the radius is 8.5 cm that would make the diameter of the circle 17 cm. (8.5 cm X 2 = 17 cm)