You find the area using Pi x radius squared then multiply that by 3/4.
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A circle with a radius of 6 cm has an area that is about 113.1 cm. 3/4 of that is 84.825 cm
To find the area of the circle pi*radius*squared and subtract the area of the figure inside
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.