" Prove that the points "(1,0),(2,-7),(8,1)" and "(9,-6)" are con-cyclic."

Show that the 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.

Show that the four points (1, 0), (2,-7), (8, 1) and (9,- 6) 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 (1,- 6), (5, 2), (7, 0) and (- 1,-4) are concyclic. Find the radius of the circle.

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

Show that the points A(1,0),B(2,-7),C(8,1) and D(9,-6) all lie on the same circle.Find the equation of this circle,its centre and radius.

Prove that the points ( 0,-1,-7) , (2,1,-9) and (6,5,-13) are collinear. Find the ratio in which the frist point divides the join of the other two.

Prove that the points ( 0,-1,-7) , (2,1,-9) and (6,5,-13) are collinear. Find the ratio in which the frist point divides the join of the other two.