First, you need to find out what the diameter of the cyllinder is,(diameter is how
long or how wide something is). Then, you divide the diameter of the cyllinder in half.
FOR EXAMPLE:
Let's say the diameter of a cyllinder is 10 centimeters, (you divide 10 centimeters in half that = 5 centimeter). So the answer is 5 centimeters.
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The radius of a circle is half of its diameter
radius = diameter/2 radius = circumference/2*pi
A congruent figure is identical to another figure. Example would be like a circle with the radius of 12 meters, then the congruent figure would have to be a circle with a 12 meter radius.
The radius is a cord, is it not?
You take out your ruler and measure it.