Radius is just a fancy name for half a circle across; a diameter is another fancy name for whole across. So it would be like draw a horizontal line across a circle so if u have the radius...multiply it by two and you have your diameter
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Divide the Diameter by 2 to get the Radius
Area of Circle = pi (radius)2 So , using this formula we can find the radius and also the diameter. Diameter = 2(radius)
you double the radius to find the diameter.
Easy, you find the area of the circle (Pi X Radius squared) and then multiply it by the height. Your question asks about using the diameter...the radius is half of the diameter.
the radius is half the diameter