For the four circles M ,   N ,   O and P , following four equations are given: Circle M   :…

For the four circles $M, N, O$ and $P,$ following four equations are given:

Circle $M : x^2+y^2=1$

Circle $N : x^2+y^2-2x=0$

Circle $O : x^2+y^2-2x-2y+1=0$

Circle $P : x^2+y^2-2y=0$

If the centre of circle $M$ is joined with centre of the circle $N,$ further centre of circle $N$ is joined with centre of the circle $O,$ centre of circle $O$ is joined with the centre of circle $P$ and lastly, centre of circle $P$ is joined with centre of circle $M,$ then these lines form the sides of a