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What is the shape of a circle called?
The shape of a circle is round. Circles are plane shapes that have all points that are the same distance from the center.
What is 2 circles of same radii called?
They are congruent circles
Are circles of different diameters that have same center called eccentric circles?
Close - they're called concentric circles.
Do circles have the same center?
No not all circles have the same centre. If the circles formula is in the form x2+ y2=r2 then the centre is always the origin= (0,0). But if the formula for the circle is in the form (x-h)2+(y-k)2= r2 then the centre is the the opposite sign of the h and the k. Eg. (x+4)2+(y-9)2=16 the centre would be (-4,9) and the radius would be 4
When are two circles concentric?
When they have the same centre. As a consequence, the distance between the two circles, along any common radial ray, is a constant.
