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Formulas of area in a circle?

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โˆ™ 2010-04-28 22:15:39

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If you know the circle's Radius, the area is [ pi times r2 ].

If you know the circle's Diameter, the area is [ 1/4 pi D2 ].

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โˆ™ 2010-04-28 22:15:39
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Related questions

Is pi in formulas?

Yes. Some examples of formulas that contain pi (∏) are: (area of a circle) = ∏r2 (Circumfrance of a circle) = ∏d


What are some examples of geometry formulas?

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Area= square the radius and times it by pie


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You use the information you're given, along with the facts and formulas you know about the geometry of a circle.


What formulas use Pi in the equation?

a formula that uses pi is the circumference and area of a circle and every polyhedron that has a circle


How are the formulas for the area of a circle and the volume of a cylinder related?

The volume of a cylinder is the cross-sectional area of the cylinder multiplied by its length. The perpendicular cross-section of a cylinder is a circle.


How did the Romans work out the area of a circle?

The area of a circle is the number of square units inside that circle, if each square in the circle to the left has an area of 1cm2, you could count the total number of squares to get the area of this circle. However, it is easier to use one the following formulas; A=.r²or A=pi times r times r, where A is the area and r is the radius.


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How do you get an area for a circle?

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