Because the area of a circle is pi*radius2 but the exact value of pi has never been determined because it is an irrational number.
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Radius. the formula is Pi-r-squared i cant find the symbols on my comp
you have to double the radius which is the distance from the center of the circle to any other point on the edge of the circle. If you mean the width is the radius then you cant figure it out. you see, the formula is 2(pi)r........r is the radius. you need to know the radius to find the diameter.
It's undefined, because we dont know the shape of the figure. If it's a square, the perimeter is 12.. if its a rectangle the perimeter MIGHT be 20... We cant determine if we dont know the figure.
i cant figure it out sorry
do it your self but if you dont or cant figure it out then it is 1