Chapter 8
... Which angles are central angles and which are inscribed angles? ∠ACB and ∠ADB are inscribed angles, subtended by the same arc AB, so they must be equal. ∠ACB = 55º ∠ADB = 55º ∠AOB is a central angle. Is ∠AOB going to be half of 55º or twice 55º? Central angles are double the inscribed angles. ...
... Which angles are central angles and which are inscribed angles? ∠ACB and ∠ADB are inscribed angles, subtended by the same arc AB, so they must be equal. ∠ACB = 55º ∠ADB = 55º ∠AOB is a central angle. Is ∠AOB going to be half of 55º or twice 55º? Central angles are double the inscribed angles. ...
