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The radius is half the diameter.

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

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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

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

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

You can't answer that without knowing the radius. To find a radius: it is the circumference divided by 2 x 3.14159, I think. Or take the diameter and half it. So, just taking any radius and multiplying it by 2 will give you the diameter. To get a radius, you measure from the center of the circle to the edge (of any part of the circle) and that number is your radius. So, say your radius was 4 cm: 4 cm X 2 = 8 cm would be your diameter. All the Best Joseyy Or, the simpler answer to the question would be "the diameter".

IF YOU HAVE A LINE THAT WILL GO AROUND THE CIRCLE, DIVIDING BY PI (3.14159) WILL GIVE YOU THE DIAMETER. HALF THE DIAMETER IS THE RADIUS. IF YOU HAVE A LINE FOR DIAMETER, MULTIPLY BY PI TO GIVE THE CIRCUMFERENCE. TO DRAW THE CIRCLE, FOLD THE LINE IN HALF AND HOLD AT THE FOLD. EITHER OR BOTH OF THE ENDS WILL SWING AROUND THE CIRCLE. IF YOU USE YOUR LINE FOR THE RADIUS, MULTIPLY THE LENGTH BY 2, THEN MULTIPLY THAT RESULT BY PI. RADIUS IS 1/2 THE DIAMETER (1/2 THE DISTANCE ACROSS) DIAMETER IS THE DISTANCE ACROSS CIRCUMFERENCE IS ALL THE WAY AROUND IF YOU HAVE A LINE THAT WILL GO AROUND THE CIRCLE, DIVIDING BY PI (3.14159) WILL GIVE YOU THE DIAMETER. HALF THE DIAMETER IS THE RADIUS. IF YOU HAVE A LINE FOR DIAMETER, MULTIPLY BY PI TO GIVE THE CIRCUMFERENCE. TO DRAW THE CIRCLE, FOLD THE LINE IN HALF AND HOLD AT THE FOLD. EITHER OR BOTH OF THE ENDS WILL SWING AROUND THE CIRCLE. IF YOU USE YOUR LINE FOR THE RADIUS, MULTIPLY THE LENGTH BY 2, THEN MULTIPLY THAT RESULT BY PI. RADIUS IS 1/2 THE DIAMETER (1/2 THE DISTANCE ACROSS) DIAMETER IS THE DISTANCE ACROSS CIRCUMFERENCE IS ALL THE WAY AROUND

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

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

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=πr²)

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

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

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

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

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

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.

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