Practicing Success
AB is a chord in a circle with center O. AB is produced to C such that BC is equal to the radius of the circle. C is joined to O and produced to meet the circle at D. If ∠ACD = 34°, then the measure of ∠AOD is ? |
76° 104° 102° 96° |
102° |
OB = OC ⇒ ∠BOC = ∠BCO = 34° We know, ∠OBA = ∠BOC + ∠BCO = 34° + 34° = 68° as OA = OB ⇒ ∠OAB = ∠OBA = 68° In ΔOAB ∠AOB + 68° + 68° = 180° ∠AOB= 44° Now, ∠AOD + 44° + 34° = 180° ∠AOB= 102° |