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What is the relationship between pi, radius, diameter and circumference?

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What is the relationship between pi, radius, diameter and circumference?

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pi is almost equal to 3.14. However no one knows the true value of pi. So whenever you are solving an equation don’t change pi to 3.14. Any ways radius is half the diameter and the diameter is the distance from one point of a circle to another point of a circle. Circumference is the distance around a circle. It is the same thing as perimeter but since circles aren’t shapes with corner they use circumference to figure it out.

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Pi is a universal constant with a value of about 3.1416. Diameter is the length across the circle, and radius is just half of that. So diameter just equals 2 times the radius. Circumference is equal to 2 times pi times the radius, or just pi times the diameter.

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Pi is a constant that is defined as the ratio between circumference and diameter of a circle: π = C / d ~ 3.14159265358979323846264338327950288419 Pi is mostly involved in circles/cylinders/spheres/trigonometry.

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The radius is half the diameter of a circle so 2 x pi x r equals the circumference and pi x d is the circumference too.

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