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To find the circumference of a circle you multiply pi, usually rounded to 3.12, by the radius. The formula for the circumference of a circle is 2*pi*radius.
So double your radius, then multiply by pi, which is approximately 3.14159265
So if I had a circle of radius 2, my circumference would be 2*3.14*2 = 12.56
Good Luck!
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How do you find the radius of a circle if you only know the area?
Radius = +sqrt(Area/pi)
How do you find the height of a cylinder with a radius of 8 inches?
It is not possible if you only know the radius. A cylinder with a radius of 8 inches could be any height.
Can you find the length of the sides of a right triangle knowing only the hypotenuse?
No.
How do you find the height of a cone knowing only the radius and the volume?
volume of a cone = 1/3 x pi x radius2 x height Rearrange the formula: height = volume of cone divided by 1/3 x pi x radius2
How do you find the diameter of a circle knowing only the circumference?
to find the diameter of a circle when you only have the circomference you: divide the circomference by pi (approx. 3.14)
How do you find the cicumference of a circle whichout knowing its area radius or diameter?
Given is a circle. Not known is its area A. Not known is its radius r. Not known is its diameter d. You want to calculate its circumference C. Impossible. It cannot be calculated. The only other way is to measure it with a tape measure.
How do you find the radius only knowing the area?
2289.06
How do you find the radius of an object by only knowing it's circumference?
Radius = Circumference/(2*pi)
How do you find the radius of a cone knowing only side length?
You cannot.
How do you find radius if cone knowing only the height?
You must have another parameter
How do you find the radius of a cone knowing only the diameter?
The radius is half the diameter, so just divide the diameter by 2.
How do you find the area of a circle by only knowing the radius?
Since the area of a circle is pi times radius squared, take the radius and square it. Then, multiply that by 3.14, or pi to get the area of the circle.
How do you find the radius of a cylinder only knowing the height and volume?
Volume = pi x r2 x h So the radius = rad(volume/(pi x h))
How do you find the measure of an arc knowing only the chord of arc and radius?
you have a triangle formed by the radius on 2 and the chord on the other. the angle in that triangle that is opposite the chord, find its measure in radians take that measure (in radians) and multiply it by the radius to get the arc length
How do you find the radius of a circle only knowing the circumference?
The equation for finding the circumference of a circle is diameter times pi so reverse it to circumference divided by pi which leaves the diameter. The diameter is twice as big as the radius so divide the diameter by 2 and you will find the radius.
How do you find the area of a circle only knowing the radius?
If you know the radius (say it's 4), square the radius and multiply that number by pi. So for a radius of four, it would be 4 X 4 = 16 X 3.14 = 50.24, the area of the circle.
How do you find the radius of a cone only knowing slant height?
If you cut the cone in half then drop a line from the point down to the centre of the base, you can then find the radius, which is the the base of one of the triangles you now have. You need to know one of the angles though, then work out the radius through trigonometry.
