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Is concentric circle and congruent circle are they same?
No. Concentric circles have the same centre but not [usually] the same radius. Congruent circles have the same radius, but not [usually] the same centre. If you have two concentric congruent circles one will be exactly on top of the other.
What word would you use to describe two circles of different radius but of the same center?
They are said to be concentric circles.
What is the intersection of two circles called?
mandorla or vesica piscis (if they have the same 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.
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.
