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

Updated: 12/8/2022

Wiki User

14y ago

The radius is half the diameter.

Wiki User

14y ago

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Q: How do you find the radius of a circle if you are give the diameter?
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### 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.

### 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 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 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 work out the area of a circle with only the diameter?

By dividing the diameter by 2 will give the circle's radius. Area of any circle = pi*radius squared.

### 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 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

### 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 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

### How do you work out tha area of a circle?

Assuming you know the radius or diameter...(Pi) x (radius) x (radius) or (1/4 Pi) x (diameter) x (diameter) will give you the area.

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

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

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

First of all, let's define circumference. Circumference is the diameter of a circle times pi (3.14) So it would take 3.14 diameters to go around the circumference of a circle. A radius is from the center of a circle to the outside. It is half the length of the diameter. So, take the radius and double it. That will give you the diameter. Take the diameter and multiply it by pi. Pi is the button on your scientific calculator that looks like Stonehenge. If you do not have a pi button, 3.14 will give you a rough estimate.