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radius = circumference/(2*pi)

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Q: How do you find the radius of a circle if you know the circumfrence?
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How do you find the area of a circle to the nearest hundredth?

If you have the radius, then area = pi*r2 which you then round to the nearest hundredth. If you do not know the radius but do know the diameter or circumference, you can calculate the radius. Otherwise you need to measure it.


How do you find the circumfernece of a circle?

If you want an approximate answer, you can measure it with string. If you want an exact answer and know the radius, multiply by 2*pi to find the circumference.


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

Given the circumference, divide the circumference by pi (3.1416) to give the diameter of the circle, then divide by 2 to find the radius (half of the diameter).Since C = (pi) D and D = 2r, then r = C/2piSee related links for more help with circles.


How do you find radius if you know the chord?

well,first the radius is half of the chord. Radius is the distance from the circle centre to the chord end. The chord is the line joining the ends of the arc. Draw this line. Call the distance from the arc of the circle at its deepest point to the mid point of the chord "c". If extended, this line will go throught the centre of the circle. Call half the length of the chord "y". Then the properties of circles and chords is that c(d-c)=y2 where d is the circle diameter, so that d = y2/c + c. And then radius is half that.


What may be calculated from its diameter?

If by "it" you mean a circle, once you know the diameter, you can calculate its radius, its circumference, and its area.

Related questions

How do you find the radius of a circle if you don't have the area?

If you do not have the area, what do you have? The radius is half the diamiter The radius is PieR2 Worked backwards if you know the circumfrence.


How Do you find the circumfrence when you know the radius?

Pi x the diameter of the circle will hive you the circumference. The diameter is double the radius so the answer to your question is pi2r.


What is the radius of a circle if given the circumfrence?

The circumference (c) of a circle = 2πr (where r = radius). Therefore if you know the circumference, the radius (r) = c/2π.


How would you find the circumfrence of a circle?

If you know the diameter of the circle, multiply that by Pi (about 3.1416). The result is the circumference.


What does the radius mean?

Wow, a question I actually know! The radius of a circle is 1/2 of the circumfrence. In other words, if your body was a circle, and you spread out youre arms, the area from you're heart to the tip of you're fingers would be the radius.


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

You already know the radius.


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

Since the formula for the area of a circle is pi times the radius squared and the formula for the circumference is two times pi times the radius, you would find the circumference by first dividing by pi. This would give you the radius squared. Find the square root of this value. This will give you the length of the radius. Take this length and multiply it by two times pi.


How do you find the radius of the base in a cylinder?

It depends on the values you have. The base of a cylinder is a circle. If you know the circle's diameter, half it to find the radius. If you know the circle's circumference, divide by 2pi to find the radius. If you know the circle's area, divide by pi and take the square root to find the radius.


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

Diameter = 2*Radius


How do you find the radius of the circle when you know the center and a point on the circle?

measure it


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

radius = circumference/2*pi


How do you find the radius and diameter of the circle if you know the area?

Area of Circle = pi (radius)2 So , using this formula we can find the radius and also the diameter. Diameter = 2(radius)