Example 4 : In Fig 10.33, ABCD is a cyclic quadrilateral in which AC and BD are its diagonals. If ∠DBC = 55 degree and ∠BAC = 45 degree, find angle BCD. ABCD is a cyclic quadrilateral in which AC and BD are its diagonals. If ∠DBC = 55 degree and ∠BAC = 45 degree [...]