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Q: Why is circumference equal to 2 times Pi times r?

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Circumference is equal to 2 times pi (3.1416) times one half of the diameter (the radius). So, if the diameter is 2 cm, then the circumference would be the product of (2) times (3.1416) times (1), or 6.2832 cm. Circumference is equal to diameter times Pi. c = Pi * d diameter times pi

If you mean a circle: the circumference is equal to diameter x pi, or 2 x pi x radius.If you mean a circle: the circumference is equal to diameter x pi, or 2 x pi x radius.If you mean a circle: the circumference is equal to diameter x pi, or 2 x pi x radius.If you mean a circle: the circumference is equal to diameter x pi, or 2 x pi x radius.

Circumference is equal to pi x diameter Diameter is equal to 2 times the radius Circumference would be 2 x pi x radius

Because 2 times the radius is equal to the diameter of the circle

The circumference of a circle is equal to the radius times 2*pi. 2*pi*R where R is the radius.

It is not pie. That is something you eat. It is pi. Your formula is Circumference = pi times Diameter. Diameter = radius times 2. If you replace Circumference with pi then what do you get? You get pi = pi, or 1 pi = 1 pi. or 1=1. You now know the diameter. if the diameter is 1, what is the radius?

Circumference = pi times the diameter, or pi times 2 times radius. Area = pi times (radius squared)

Circumference of the can is 2*pi*radius or diameter times pi

A soccer ball is 27 to 28 inches in circumference. Circumference is pi times diameter, or 2 times pi times radius. Radius = circumference divided by (2 times pi).

Using a compass and the circumference is measured by 2 times pi times radius or diameter times pi.

to calculate circumference you find a circles radius or diameter. you do diameter times pi or radius times 2 times pi. the you have circumference!

To calculate circumference you find a circles radius or diameter. you do diameter times pi or radius times 2 times pi. Then you get the circumference.

Circumference is equal to 2 times pi times the radius. The radius is half the diameter, so pi times the diameter is also the circumference. In this case, the diameter is 3 meters so 3 times pi equals 9.42 So the circumference is about 9.42 meters.

A=pir2 a=3.14(2)2 a=3.14(4) a=pi*d area =pi r 2 circumference=pi times d in this equation in terms of pi, a=csquared

A soccer ball is 27 to 28 inches in circumference. Circumference is pi times diameter, or 2 times pi times radius. Radius = circumference divided by (2 times pi).

The simple answer is that pi is the ratio of the circumference divided by the diameter of any circle. This is universally true because any circe, big or small, has the same ratio. Therefore, the circumference is equal to pi times the diameter, or pi times two times the radius. The long answer involves arc length integrals over the equation for a circle, y=sqrt(r^2-x^2)

Circumference is 2 times pi times radius, so the circumference of this circle is 2 times pi times 5, or 10 times pi. If a decimal answer is needed, pi is approximately 3.14, so C=31.4

No. Circumfrence=2 times pi times radius. And since the daimeter = 2 times radius, circumference is diameter times pi.

Because the circumference is equal to the diameter multiplied by pi or the radius multiplied by 2*pi.

The diameter multiplied by (pi)2 . That's about 9.87 times the diameter.

The 360 degrees is equal to 2 pi radians. That's 2 times the value of pi (3.14) radians. A radian is a "radius" or the length of a radius. It's that simple, so don't let it confuse you. Angular measure is easy. If you have 180 degrees, that half way around the circumference of a circle. And 360 degrees is one complete circle, or a circumference. That's what you asked about. The question is essentially, "How many radii in a circumference?" Circumference (C) equal pi times diameter (d) or is equal to 2 times the radius (r) times pi. C = pi * d C = 2 * r * pi (It's usually written 2 * pi * r)

The circumference of any circle = diameter*pi or 2*pi*radius

The ratio of the circumference of a circle to its radius is 2 pi, or 2 times pi. Pi is approximately 3.14.

The circumference C of any circle is equal to pi*diameter. The diameter is equal to the radius times 2. So, for a circle with radius 48, it has a diameter of 96, and a circumference of 96*3.14=301.44. This of course is using 3.14 as an estimate for pi.

No it is 2*radius*pi or diameter*pi or 2(pi)r