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how to find radius of circle if you know equation?

Updated: 11/10/2020
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Marlin Ali

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4y ago

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To calculate the radius of a circle by using the circumference, take the circumference of the circle and divide it by 2 times π. For a circle with a circumference of 15, you would divide 15 by 2 times 3.14 and round the decimal point to your answer of approximately 2.39

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Jazlyn Hoppe

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4y ago
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Q: How to find radius of circle if you know equation?
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Related questions

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

You already know the radius.


What is the mathematical equation you generally use to find the circumference of a circle when you know the diameter?

circumference of a circle = diameter*pi or 2*pi*radius


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

OK, SO to find the area of a circle, you find the radius (half of the diameter), and fit it into the equation πr2=A where r equals radius and A = area. The perimeter of a circle is π multiplied by the diameter. π is ≈ 3.1415296.


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 are of a circle with only the circumference?

It's important to know the formulas for all these characteristics of circles, and to recognize what they have in common. Area of a circle = πr2 Circumference of a circle = 2πr or dπ Where in the above equations r represents radius, and d is diameter (2r). Both these equations have r in them. Find the radius using the circumference equation, and then plug it into the equation for Area


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 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)


How do you find the radius if you do not know the diameter?

You can measure it. Otherwise, you certainly have to know SOMETHING about the circle to calculate the radius, usually the diameter, the circumference, or the area. If you don't know anything at all about a circle, you can't find out the radius, either.


What is the length of this radius of the circle?

To find the radius you should either know the area or the circumference. The area is found by multiplying the radius squared by pi which is 3.14159 The equation is ... A=pi x r2 The area is the total amount of space inside the circle The circumference is found by multiplying 2 and pi and radius together. The equation is ... C=2 x pi x r The circumference is the total amount of length around the outside of the circle. So with this information you should be able to find the length of the radius. If your not sure what the radius is. The radius is the length from the center of the circle to one of the points on the outer side of the circle. The radius is the same distance to any point on the outer side of the circle as long as the radius starts in the middle point of the circle.