how to get circumference of circle

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Apr 24, The diameter is the simplest measurement for finding the circumference of a circle, and it requires the fewest steps. Start with the formula C = ?d (circumference = x diameter). If you enter ? (pi) into your calculator, you will get the longer, more accurate value for pi. But you can also use the acceptable approximation for ?, which is Jan 06, To calculate the circumference of a circle, multiply the diameter of the circle with ? (pi). The circumference can also be calculated by multiplying 2?radius with pi (?=). How to Calculate Diameter from Circumference? The formula for circumference = diameter ? ?.

You can find the circumference of a circle by using the measurement of its diameter, radius or area. The circumference of a circle is the distance around the circle's edge from one point, meeting back at that point. Knowing how to calculate a circle's circumference can be what are the components of an abstract in math class but also in real-life situations such as craft projects and construction tasks.

Reviewing the features of a circle before you begin is a good way to avoid calculating incorrectly. A circle is a symmetrical, round, two-dimensional figure. The circumference, or distance around the circle, includes a series of points that are all equidistant from the exact center of the circle.

The diameter is a line segment that passes from one point on the circle's edge directly through the middle of the circle to a point on the circle's opposite edge. The radius is a line segment that extends from one point on the edge of the circle inward to the center of the circle. The area of a circle is the space inside the circle. The diameter is the simplest measurement for finding the circumference of a circle, and it requires the fewest steps. The radius of a circle, half of its diameter, can help you find the circumference in a couple of steps.

The circumference of the cookie is Using the area to find the circumference of a circle how to get circumference of circle slightly more complex. First you must find the radiushow to get circumference of circle the diameter and then the circumference. If you know that the area inside a circle is equal to Your equation would look like this: Divide both sides of the equation by 3.

The radius will be 7 inches. Rachel Pancare taught elementary school for seven years before moving into the K publishing industry. Copyright Leaf Group Ltd.

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The formula for working out the circumference of a circle is: Circumference of circle = ? x Diameter of circle This is typically written as C = ?d. This tells us that the circumference of the circle is three and a bit times as long as the diameter. Oct 23, The circumference of a circle is merely the distance around a circle. Sometimes it is referred to as the perimeter, although the term perimeter is usually reserved for the measure of a distance around a polygon. The equation for the circumference of a circle can be written in two ways: C = 2?r. The circumference of a circle is calculated using the formula: 2 x ? x radius, where ? is a mathematical constant, equal to about It was originally defined as the ratio of a circle's circumference to its diameter (see second formula below on why) and appears in many formulas in .

Last Updated: March 4, References. This article was co-authored by our trained team of editors and researchers who validated it for accuracy and comprehensiveness. There are 11 references cited in this article, which can be found at the bottom of the page. This article has been viewed , times.

Learn more But what do you do if you only know the circle's area? Like many things in math, there are multiple solutions to this problem. Both equations provide the same result. Log in Social login does not work in incognito and private browsers. Please log in with your username or email to continue. No account yet? Create an account. We use cookies to make wikiHow great. By using our site, you agree to our cookie policy. Cookie Settings. Learn why people trust wikiHow.

Download Article Explore this Article methods. Related Articles. Method 1 of All rights reserved. This image may not be used by other entities without the express written consent of wikiHow, Inc. This formula calculates the circumference of a circle if you only know its area. C represents the circumference, and A represents the area. Set this formula up to begin solving the problem.

For simplicity, use 3. Plug the area into the A position of the equation. Since you already know the area of the circle, plug that into the A position. Then proceed to solve the problem using the order of operations. Multiply pi by the area of the circle. In the order of operations, the operations inside the square root symbol go first.

Multiply pi by the area of the circle that you plugged in. Then plug that result into the equation. Find the square root of the sum. There are multiple ways to calculate square root. You can also work the problem out by hand using prime factorization.

Multiply the square root by 2 to find the circumference. Finally, complete the formula by multiplying the result by 2. This means that the circumference is Method 2 of This is the formula to find the area of a circle. A represents the area, and R represents the radius. Use whichever number you know represents the circle's area. Put it on the left side of the equation in the A position.

Divide both sides of the equation by 3. To solve equations like this, gradually eliminate steps from the right side by performing the opposite operations. Since you know the value of pi, divide each side by that value. This eliminates pi from the right side, and gives you a new numerical value on the left side.

This makes the new equation Find the square root of the result to get the circle's radius. Next, get rid of the exponent on the right side of the equation. The opposite of squaring a number is finding the square root of the number.

Find the square root of each side of the equation. This eliminates the exponent on the right side and gives you the radius on the left side. This makes the equation 7. This gives you all the information you need to find the circumference. Find the circumference of the circle using the radius. There are 2 formulas to find circumference C. Multiply the radius by 2 to find the diameter. Multiply 3.

Both formulas give you the same result. This diameter times 3. For the second option, set up the equation as 2 x 3. First, 2 x 3. Notice how both methods give you the same answer. Can I have an explanation of how to find circumference of a circle using area? As explained above: 1 Divide the area by 3. That is the radius.

That's the circumference. Yes No. Not Helpful 28 Helpful You're given the area. Divide by pi 3. That gives you the square of the radius.

Find the square root. That's the radius. Double it. That's the diameter. Multiply by pi 3. Not Helpful 45 Helpful Use a calculator, if that's not prohibited. Not Helpful 21 Helpful Submit a Tip All tip submissions are carefully reviewed before being published.

Related wikiHows How to. How to. More References 2. About This Article. Co-authored by:. Co-authors: Updated: March 4, Categories: Calculating Volume and Area. Nederlands: Cirkelomtrek berekenen met de oppervlakte.

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