Area of a circle = Pi * radius2
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the area of the circle is increased by 400%
Area of a circle = pi*radius2
The area of a 3 cm circle is: 7.069 square cm
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
Area of a circle = pi*radius2