Find a center And the radius of a circle x square + y square - 4x + 2y - 4 = 0. Hence prove that x +1 =0 Is a tangent to the circle. Calculate the coordinates of the point of contact. If this point of contact is A. Find the coordinates of the other End of the diameter through A.

Q10. Find the centre and the radius of the circle x^{2}^{ }+ y^{2} – 4x + 2y – 4 = 0. Hence or otherwise, prove that x + 1 = 0 is a tangent to the circle. Calculate the coordinates of the point of contact. If this point of contact is A, find the coordinates of the other end of the diameter through A.