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It is: 2*pi*radius

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11y ago

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How do you find the radius by using the cirumference?

Circumference= 2(Pi)r so just work backwards :)


If you are given a radius and asked to find the diameter what do you do?

You just multiply the given radius by 2. That is diameter is just double of the radius. This is universal formula.


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.


Why is it so important to know the circumference of a circle when finding the surface area of a cylinder?

It is not. Knowing its radius or diameter will do just as well.It is not. Knowing its radius or diameter will do just as well.It is not. Knowing its radius or diameter will do just as well.It is not. Knowing its radius or diameter will do just as well.


What is the equation for finding the radius of a sphere?

That depends what you know about the sphere. For example, if you know the diameter, just divide it by 2 to get the radius.


Formula of diameter of a circle?

the diameter is the radius of a circle times 2. you just double the radius.


How can you determine the area of a circle by using the radius squared and without finding the radius?

The area of a circle is pi * radius2. If you already have the radius squared, you just have to multiply that by pi.


How do you find the area of a semi-circle radius 10cm?

πr² is the formula for finding the area of a circle. To find the area of a semicircle just divide the answer by two. So take the radius, square it, which in this case would be 100, multiply it by π [pi (3.14)] and divide it by two.


What is the volume of a sphere with a radius of 15 units?

Just insert the radius into the formula for the volume a sphere, and do the calculations. The formula is: V = (4/3) pi radius3


What is the area of Pluto in kilometers?

just get the radius of pluto and put in this formula:4 multiplied by radius sqrared multiplied 3,14


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

use the formula pi*diameter = circumference and the formula diameter = 2*radius and combine them 2pi*radius = circumference now you have a formula that you can just plug you numbers into. if you have 3 as your radius, then this is how to find the circumference 2pi*3=circumference 6.28*3=circumference 18.84=circumference


What is the radius of a circle whose area is 616 square meters?

Well, isn't that just a happy little question! To find the radius of a circle when you know the area, you can use the formula A = πr^2. In this case, the area is 616 square meters, so you can plug that in and solve for the radius. Just remember to take a deep breath, trust in your math skills, and enjoy the process of finding the radius of this circle.