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Are circles congruent?
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.
What is the circumference of a 12 foot diameter circle?
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.)
Pi is the ratio of a circles circumfrance to its what?
diameter ------------- Diameter. The R (radius) of a circle multiplied by two equals the diameter.
How do you find the radius of a circle if you have the circumference?
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.
If there are two circles and the small one has diameter of 20 what is the radius of the big circle?
You need some more information about any of the circles, or about the relationship between the two circles, to answer this question.
