` Prove that the points (1, 2), (3, - 4), (5, -6) and (11,-8) are concyclic

Prove that the points (1,- 6), (5, 2), (7, 0) and (- 1,-4) are concyclic. Find the radius of the circle.

Prove that the points A(4, 0), B(6, 1), C(4, 3) and D(3, 2) are concyclic.

Show that the points (2, 0), (5, -3), (2, -6) and (-1, -3) are concyclic, find the equation of the circle on which the points lie and the coordinates of the centre of the circle.

Prove that the points (1,-6), (5,2) , (7,0) and (-1,-4) are concyclic. Find the radius of the circle .

Show that the points ( 1,0),(2,-7) , (8,1) and (9,-6) are concyclic.

Show that the points (3,-2),(1,0),(-1,-2) and (1,-4) are concyclic.

Show that the points (1,1),(-6,0),(-2,2) and (-2,-8) are concyclic.

Prove that the points (2,0), (-2,0),(-1,3) and (1,-1) are concyclic.

Show that the four points (1,0), (2,-7), (8,1) and (9,-6) are concyclic.

Show that the four points (1, 0), (2,-7), (8, 1) and (9,- 6) are concyclic.