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The formula for the area of a circle is pi x radius2. You might round pi, which is about 3.1416, to the fraction 22/7 ( which equals 3.1428) if you like, but this (just like the decimal quoted above) is only an approximation.
The two numbers give answers that are only 0.2% different.
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Earn +20 ptsQ: How do you work out the area of a circle using fractions?
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How do you work out the area of a circle with only the diameter?
By dividing the diameter by 2 will give the circle's radius. Area of any circle = pi*radius squared.
How do you work out the area of a circle on excel?
Area of circle = PI * R2In A1 enter radius of circle (e.g. 4).In B1 enter this formula: =PI()*A1^2Observe in B1 the number as the area of a circle with radius of 4.
How do you work out the area of a quarter of a circle?
It is: (pi*radius2)/4
Does the area of a sector depend pi?
The area sector of a circle needs pi to work it out.
Is a sector area the percentage of the circle's area?
Yes. That is often how pie charts work.
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