Yes.
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Two figures are congruent if you can "pick one up" and then place it down on top of the other one in such a way that the two exactly overlay each other... in other words, if they are the exact same shape and size. So, any two circles will always have the same shape, but not necessarily the same size. Only circles that have the exact same size (as measured by matching radius, diameter, circumference, or surface area) are congruent.
Circumference= 37.68 feet. All you have to do is multiply the diameter by pi. Same with radius. Multiply the radius by two to get the diameter then do diameter times pi.(pi= 3.14 or 22 over 7.)
diameter ------------- Diameter. The R (radius) of a circle multiplied by two equals the diameter.
Easy to do. First, divide the circumference by Pi (about 3.1416). The result is the diameter. Now, divide the diameter by two to get the radius.
You need some more information about any of the circles, or about the relationship between the two circles, to answer this question.