In the given figure, two chords PQ and RS intersects each other at A and SQ is perpendicular to RQ. If ∠PAR – ∠PSR = 30°, then find the value of ∠ASQ?
In the figure, PA is a tangent from an external point P to the circle with centre O. If ∠POB = 110°, then the measure of ∠APO is:
In a circle of centre O, PR = 3a + 5 and RQ = 5a – 5, OR = 15 units, ∠ORP = 90°. Find the radius of the circle.