XY and X'Y' are two parallel †an gents to a circle with center O and another †an gent AB with point of contact C intersecting XY at A and X'Y' at B.Prove that\angle AOB=90^°

XY and X'Y' are two parallel †an gents to a circle with center O and

1.	XY and X'Y' are two parallel †an gents to a circle with center O and another †an gent AB with point of contact C intersecting XY at A and X'Y' at B.Prove that\angle AOB=90^°
Answer» XY and X'Y' are two parallel †an gents to a circle with center O and another †an gent AB with point of contact C intersecting XY at A and X'Y' at B.Prove that\angle AOB=90^°