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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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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.
The value of pi related to circle?
It is used to work out the area of a circle by using the formula πr2 and the circumference (Perimeter) πd. πr2 - Area: Pi x Radius2 πd - Circumference: Pi x Diameter π = 3.1415...
What is a ratio about?
There are two kinds of ratios. One is the ratio of a circle, which is half the circle's diameter, (which is the length of the circle across), which can be used to find the circles area. (the ratio squared multiplied by pi). The other ratio is something that looks like this 1:2 which work similar to fractions. Such as, for every one ____ there are two ___.
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 cycle?
Area of any circle = pi*radius squared
What is the radius and the area of a circle?
The radius of a circle is the distance from the center to any point on the circle. The area is the space within the circle. The formula to find the area is πr2. r stands for the radius of the circle. If you want to find the radius, you can work backwards from the area or the circumference, which is the perimeter of the circle. The formula for circumference is 2πr.
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.
Why does the formula for area of a circle work?
It says so in the formula
How do you work out the area of circle?
Pi times the square of the radius.
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.
How do you measure the area of a circle and why does it work?
The area of a circle is equal to that of a triangle whose base has the length of the circle's circumference (distance around the circle) and whose height equals the circle's radius which comes to Pi multiplied by the radius squared. Area of Triangle 1/2 *base*height
