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.
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Diameter is the width of a circular or spherical figure or object. Something 180 inches in diameter is also 180 inches in width or thickness.
radius = diameter/2 radius = circumference/2*pi
If you know the radius, double that to get diameter. If you have neither radius or diameter, then measure around the outside.
If by that you mean knowing only the diagonal and the width, then by the formula a2+b2=c2, where a is the length, b the width and c the diagonal. To find the width b, you need to calculate sqrt(c2-a2). For example, the width of a rectangle with length 3 and diameter 5 is sqrt(52-32)=4
Oh, dude, it's like super simple. So, the diameter of a circle is just the distance across it, right? And the width is just the distance from one side to the other. So, to convert diameter into width, you just divide the diameter by pi. Easy peasy!