If the circle is five feet across - that is the diameter.
To find area of a circle using diameter, you use this formuler. Area=pi(diameter/2)(diameter/2)
You can divide the diameter by two.
Divide the circumference by pi, and that will give you the diameter.
Assuming you are talking about a circle:* If you know the radius of the circle, multiply that by 2. * If you know the circumference of the circle, divide that by pi. * If you know nothing, you need to measure either the radius, the diameter, or the circumference.
The formula for the area of a circle is: area = pi x radius2. The radius is half the diameter.
pi times the diameter
The radius of a circle is half of its diameter
Pi times the radius of the circle squared = area And diameter is simply the radius x 2, since the radius is half the length of the circle.
Take "pi" times the diameter of the circle. Pi = 3.14159 (ALWAYS) If circle has a diameter of 10cm, circumference 31.41cm If circle has a radius of 2inches, the circumference is 12.57 inches. (radius = 2, diameter = 4)
2 times pi times radius
The radius of a circle is from the middle to the edge, or half the diameter. The circumference is like the perimeter of the circle, and the formula is pi times the diameter.