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

The points (0,0),(1,0),(0,1) and (t, t) are concyclic then t=

The points (1,0),(0,1),(0,0) and (2k,3k),k!=0 are concyclic if k =

Prove that the points A(0,-1),B(-2,3),C(6,7) and D(8,3) are the vertices of a rectangle ABCD .

Show that the points A(1,3,2),B(-2,0,1) and C(4,6,3) are collinear.

Show that the points (0,-1), (2, 1), (0, 3), and (-2, 1) are the corners of a square.

Show that the points A (-2, 3, 5), B(1, 2, 3) and C(7, 0, -1) are collinear.

Show that the points P(- 2 , 3, 5) , Q (1, 2, 3) and R(7, 0, -1) are collinear.

If the points (a^(2), 0),(0, b^(2)) and (1,1) are collinear then

The four distinct points (2, 3), (0, 2), (4, 5) and (0, k) are concyclic if the value of k is:

If the point (2,0) ,(0,1) , ( 4,5) and ( 0,c) are concyclic, then the value of c is :