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# How do you find the radius and diameter when they give you a circumference?

Updated: 12/15/2022

Wiki User

14y ago

divide the circumference by pi ( 3.146) which will give you the diameter divide that by 2 and you have the radius

Wiki User

14y ago

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Q: How do you find the radius and diameter when they give you a circumference?
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### What is the radius if you have the circumference?

Circumference divided by pi to find the diameter then divide that by 2 to give you the radius.

### How do you find the radius for a circle when they give you the circumference?

You divide the circumference by Pi (about 3.1416). This gives you the diameter. Divide the diameter by two to get the radius.

### How can you find the diameter of a eight inch circumference?

circumference=2(pi)r so divide the given circumference on 2pi, it will give radius. Now multiply radius by 2 you will get the diameter.

### How do you find the circumference with no radius or diameter?

They would have to give you enough information to eventually get the diameter. If they gave you the area of a circle and asked for the circumference, you can determine the radius, and from the radius the diameter, and then the circumference. If they said "What is the circumference if the area of a circle is 36pi?" Area of a circle is pi*r2, which would give us a value for r = 6 Diameter is 2*r, or = 12. Circumference is d*pi, or 12pi

### If you Give a circle with a diameter of 4 what is the circumference?

the equation for the circumference of a circle is 2*radius*pi, or since the radius is half of the diameter 2*radius=diameter, we can simplify the equation to the circumference of a circle=diameter*pi

### How do you calculate the diameter and the circumference of a circle?

Doubling the radius will give the diameter and times this by pi will give the circumference of the circle.

### How do you find the radius if you dont know the diameter but you know the cicumference?

Dividing the circumference by 2*pi will give the value of the radius.

### How do you find the radius of a circle having the circumfernce?

Divide the circumference by Pi (3.14159), and that will give you the diameter. Divide that number by 2 to find the radius.

### How do you find area of a circle when you have the circumference circle?

Divide the circumference by pi, and that will give you the diameter. Then take half of the diameter (the radius), and plug it into the formula for the area of a circle (A=&pi;r&sup2;)

### How do you find the diamater of a circle by knowing its curconferance?

By dividing the circumference by 2*pi will give you the radius and twice the radius gives you the diameter.

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

Circumference divided by pi to find the diameter then divide that by 2 to give you answer!! Formula: R=c/pi/2 eg. circumference =60 so, 60 divided by pi = 19.098, then divide 19.098 by 2 to give you 9.549!!

### How do you find the radius of a circle if you know the diameter?

If you know the diameter of a circle you simply divide the diameter by 2 to get the radius. This is because the diameter is twice the length of the radius. For example, if the diameter is 10 divide by two which will give you the answer of 5 for the radius. Half it because: diameter/2 = radiusTo answer your question you must have a certin diameter. You must go 2pie times your diameterThe perimeter of a circle is called the circumference. The circumference is the distance around the circle.The circumference, C, of a circle is given by the formulawhere r is the radius of the circleA radius is half the diameter