Question

Two tangents PA and PB are from an external point P to a circle with centre O such that angle APB =x and angle AOB=y.Prove that opposite angles are supplementary.Just want to confirm the answer

Answer 1

angle A = 90 degree
angle B = 90 degree 
when we will add 
angle a + angle b =180 degree                 (ASP)
90+90=18
180  =180 
hence proved