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# What are the formulas for finding the circumference diameter and radius?

Updated: 11/2/2022

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Q: What are the formulas for finding the circumference diameter and radius?
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### What is the unit for finding a circumference?

The unit for a circumference is the same as the unit for length (or radius or diameter).

### How do you find the radius of a circle only knowing the circumference?

The equation for finding the circumference of a circle is diameter times pi so reverse it to circumference divided by pi which leaves the diameter. The diameter is twice as big as the radius so divide the diameter by 2 and you will find the radius.

### If 2.5 is the diameter then what is the radius?

Radius is 1/2 of a diameter. 2.5/2 is 1.25. Radius is necessary in finding the circumference and area of a circle.

### Why is it important to know the difference between diameter and radius?

When you are using mathematical formulas, it is good to know the difference. For example finding the circumference or area of a circle.

### How do you find a diameter of a circle?

If you have the circumference: circumference = (pi) * diameter diameter = circumference / (pi) If you have the area: area = (pi) * radius * radius radius = square_root(area / pi) radius = diameter / 2 diameter = 2 * square_root(area / pi)

### What is the formuls for finding the circumference?

It depends on what information you have: radius, diameter, area, etc.

### How do you find the circumference if you know the radius?

Okay finding circumference from knowing the radius right? The radius is equal to half the diameter and circumference is equal to pi * diameter. So double the radius and multiply it by 3.14 then you will get the circumference!

### How do you you find the circumference if you have the radius?

The formula for finding the circumference is C = Pi x D, where Pi = 3.1416 and D is the diameter. The Radius is one-half of the diameter., So, multiply the radius by 2 and then multiply by Pi.

### How do you find the diameter and then the circumference if you have the radius?

Diameter = radius * 2 Circumference = pi * diameter.

### Why are there two formulas to calculate the circumference of a circle?

They are: 2*pi*radius or as diameter*pi

### What is the formula for finding circumfernce?

circumference of a circle = 2*pi*radius or pi*diameter

### What is the formula for finding the radius of sphere?

1/2 diameter or the circumference/pi/2