Question

circle having same Centre are said to be

Answer 1

Circle is the path followed by a point which during its entire journey is at equal distance from a certain point.

A very simple definition for circle is a closed curve but this cannot score you enough marks in. examinations so prefer writing the first explanation.

Circle which have same centres but different radii are known as concentric circle.

The radius of outer circle is greater than that of inner circle and the area of outer circle is greater than that of inner circle.