AOB is a diameter of a circle having centre.O. C is any point on it. If `angleOBC = 60^@`, then `angleOCA`=?

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

AOB is a diamter of a circle with centreO, C is any point on the circle If AC = 6cm and BC = 8cm then AB=

AB is a diameter of a circle. C is any point on the circle, angleACB=

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

AOB is a diameter of a circle , C is a point on the circle. If angle OBC=60^(@) , then find the value of angleOCA

AB is a diameter of a circle with centre at O. If chord CD bot AB and angleCAD = 80^@ , then angleADC =

AOB is a diameter of a circle with centre O and C is any point on the circle, joining A, C, B, C, and O, C, prove that tanangleABC=cotangleACO

AOB is a diameter of a circle with centre O and C is any point on the circle, joining A, C, B, C, and O, C, prove that sin^(2)angleBCO+sin^(2)angleACO=1

AOB is a diameter of a circle with centre O and C is any point on the circle, joining A, C, B, C, and O, C, prove that cosec^(2)angleCAB-1=tan^(2)angleABC .

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) .