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With a ruler, or other suitable length measuring device.

Measure the diameter (the widest part of the circle). The radius is half the diameter.

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Q: How find you find the radius if you don't know the circumference?
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Related questions

How do you find the radius of a circle if you dont know the circumference?

Well, if you know the diameter you divide that by two to get the radius.


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.


What formula is used to find the circumference when you know the radius?

Circumference=2*pi*radius


What is the formula for finding the diameter of a circle when the circumference is given?

the Circumference is pi times 2 times radius If you know circumference then you can find the radius. once you know the radius just multiply by 2 to find the diameter.


How do you find the circumference if you know radius?

Circumference of a circle = 2*pi*radius


When you know the circumference of a circle how do you find the diameter?

If you know the circumference of a circle, you can find the radius by dividing the circumference by the value of Pi (3.14159...)


How do you find the raduis if you know the circumference?

Radius (not raduis) =circumference/(2*pi)


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

radius = circumference/(2*pi)


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

radius = circumference/2*pi


How do you find the length of of the radius of a circle?

You can either measure it, or calculate it if you know the diameter (radius = diameter / 2), or the circumference (radius = circumference / (2pi)).


What is the equation for finding the radius of a sphere when you know the circumference?

The equation for circumference is C=2(pi)(r) where C is the circumference and r is the radius. You can find the radius by plugging in the circumference into this equation and solving the equation.


The radius of the circle is 5inches what is the circumference?

The circumference of a circle that has a radius of 5 inches is 10 X pi or approximatly 31.415926535897932384626433832795. If you know the radius you can find the circumference by multiplying it by 2(pi)