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2 * pi * r

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Q: What formula do you use to find the perimiter of a circle?
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What is the formula to find the perimiter?

It depends what shape you are trying to find. If it is a circle, use the following:C = DpiCircumference = Diameter x PiTake the diameter of the circle, or twice the radius, and multiply it by pi, which is ~3.14If it is any other shape, just add up the sides if they are given.


What formula do you use if you know the diameter of a circle and want to find the circumference?

circumference of a circle = pi * diameter.


How do you find the area of a circle from the radius?

Use this formula: A = PI(r)^2


How do you find the area of a segment of a circle?

In order to find the area of a sector of a circle you can use the formula below: pi*r^2 * # of degrees/ 360


How do you find the area of a circle with a radius is 3cm?

Use this formula: A = PI(r)2


When would a architect use the pythagorean theorem?

simply to find area,distance, and perimiter


What is the formula for the diameter or a circle?

If you are given the radius of the circle, you can use the formula: diameter = 2*radius If you are given the circumference of the circle, you can use the formula: diameter = circumference/pi


How do you find the bottom half of a circle?

To find the area of half a circle, use the formula for a circle pi*r^2 divided by 2. pi = 3.14, r = radius (half the distance across the circle)


How do you work out perimeter of circle?

To find the circumference (distance around) of a circle, use the formula pi x d (d=diameter)


What formula will you use to find the circumference of a circle whose diameter is 2.2h?

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


What is circumference of a circle with 154 square inches?

Use the standard formula for the area of a circle to find out the circle's radius. Then multiply that by 2 x pi, to get the circumference.


How do you find out the base of a cone?

It is a circle, so use the formula "pie r squared" to figure it out