AB is diametr of the circle with centre at O and P is any point on the circle. If `angle AOP=120^(@)` then `anglePBO`=

AB is a diameter of a circle with centre at O. C is any point on the circle. If angleBOC = 110^@ , then angleBAC =

In the circle with centre O and A,B,C are the points on the circle, angle AOB = 60^(@) . Find angle ACB

AB is a diameter of the circle with centre at O. R is any point on the circumference of the circle. If /_ ROA = 120^@ , then firnd the volue of /_RBO /

AB is a diameter of a circle with centre O , P is any point on the circle, the tangent drawn through the point P intersects the two tangents drawn through the points A and B at the points Q and R respectively. If the radius of the circle be r , then prove that PQ.PR=r^(2) .

PQ is tangent drawn from point P to a circle with centre O and QR is a diameter of the circle, such that anglePOR=120^(@) . Then, angleOPQ=…….. .

PQ is a tangent drawn from a point P to a circle with centre O and QOR is a diameter of the circle such that angle POR =120^(@) . Find angle OPQ .

PQ is tangent at a point R of the circle with centre O. If ST is a diameter of the circle and angle TRQ = 30^(@) find angle PRS