O is the circumecentre of `Delta ABC and D` is the mid point of BC. If `angle BAC=40^(@)`, then find the value of `angle BOD`.

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

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

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

In the isosceles Delta ABC,AB=AC . The circumcentre of Delta ABC is the centre O lies on the opposite side of BC in which a lies. If Delta BOC=100^(@) , then find the value of angle ABC angle ABO .

O is the circumcentre of Delta ABC and OD is perpendicular on the side BC, prove that angle BOD= angle BAC

The circumcentre of the triangle ABC is O . Prove that angle OBC+angle BAC=90^@ .

The circumcentre of the triangle ABC is O . Prove that angle OBC+angle BAC=90^@ .

(i) The circumcentre of the triangle ABC is O, If angle BOC=80^@, then angle BAC=