AB is a chord of a circle with radius ‘r’. If P is any point on the circle such that ∠APB is a right angle , then AB is equal to ?? how to solve this question & plz tell the method for solving Share with your friends Share 0 G. Pavitra Sai answered this it is the converse of the theorem"angle in the semicircle is a right angle triangle" so then diameter=2r 8 View Full Answer Mugdha Sharma answered this Obviously AB is equal to 2r because diameter is the only chord which makes 90 degree on any point inside the circle 1