Q: How do you figure out circumference and radius?

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If the figure is truly a circle, then the circumference is (Radius) x (2 pi) .

radius = diameter/2 radius = circumference/2*pi

The radius would be about 2. To figure out the circumference it is (2)(3.14)(the radius). So I just reversed the situation to (12.62) / (3.14) / (2).

Circumference = 2*pi*radius or diameter*pi

Circumference = 2*pi*radius Radius = Circumference/(2*pi)

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If the figure is truly a circle, then the circumference is (Radius) x (2 pi) .

Circumference is pi times diameter. Diameter is circumference divided by pi. Diameter is twice the radius. Radius is half the diameter.

radius = diameter/2 radius = circumference/2*pi

U take 3.14rsquare (r= radius)

The radius would be about 2. To figure out the circumference it is (2)(3.14)(the radius). So I just reversed the situation to (12.62) / (3.14) / (2).

Circumference = 2*pi*radius or diameter*pi

Circumference is the enclosing boundary of a curved geometric figure, especially a circle. Radius is a straight line from the center to the circumference of a circle or sphere. Pi is the numerical value of the ratio of the circumference of a circle to its diameter and does not have a circumference or radius of its own.

Circumference = 2 x {pi} x radius = {pi} x diameter

r = C /2 pi

Figure it out. AREA= 3.14 times the radius squared.

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)

98pi ie 307.9m to one significant figure