O is the circumcentre of `Delta ABC` and if `/_OAB = 50^@`, then the value of `/_ACB` will be

O is the circumecentre of triangle ABC. If angleOAB=50^(@) , ten the value of angleACB is

O is the circumcentre of Delta ABC and OD bot BC . Prove that angle BOD= angle BAC

O is the circumcentre of the triangle ABC. If angle BAC =50^@ , then angleOBC is equal to

In a DeltaABC, P and Q are the mid-points of AB and AC respectively. If O is the circumcentre of the Delta ABC, then the value of (("Area of "Delta ABC)/("Area of " Delta OPQ)) cot B cot C equal to

O is the circumcentre of the triangle ABC and angle BAC = 85^@ , angle BCA = 75^@ , then the value of angle OAC is

In the adjoining , O is the centre of the circle. ACB is a segment. If angle OAB=30^(@) , then find the value of angle ACB .