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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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Earn +20 ptsQ: How did the Romans work out the area of a circle?
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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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