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you take the radius and multiply it by itself. then you multiply the radius squared by 3.14 to get the area of a circle...

Q: How to find area of a circle?

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Area of a circle = pi*radius2

Find the area of the circle and divide by 4.

how do you find the area of a semi circle

A semicircle is 1/2 of a circle. Find the area with the diameter you are given as if you had a whole circle, then divide that answer by 2 to get the area of the semicircle.

Find the area of the whole circle and divide by two. Area of semicircle = 0.5*pi*r2, where pi = 3.14159 and r is the radius

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all you do is find the area of the circle... if you mean find the squares area, find the area of the circle, and then the square's area and subtract the squares area to the circles area

You find the area of the whole square first. Then you find the area of the circle inside of it And then subtract the area of the circle from the area of the square and then you get the shaded area of the square

To find the area of the circle pi*radius*squared and subtract the area of the figure inside

Area of a circle = pi*radius2

Find the area of the circle and divide by 4.

First find the area of the larger circle and then subtract the area of the smaller circle. Area=(pi x radiuslarger)-( pi x radiussmaller)

Area of a circle = pi*radius2

area of a circle = pi*r2

how do you find the area of a semi circle

Area of a circle = pi*radius2

You add the area of the square with the area of the semi circle.

In order to find the diameter of a circle if you have the area is to rearrange the formula for the area of a circle to put diameter as the unknown, like so: PIE*d = Area of a Circle d = (Area of a Circle) / PIE Therefore if the area of your circle is 40cm, 40/PIE = 12.73cm and that's the diameter.