Two congruent angles are simply pairs of angles with equal measures. You can find congruent angles examples in hundreds of everyday objects. For instance, think of any time you've tried to draw a ...

Circle theorems - Higher; Angles at the centre and circumference - Higher; Angles in the same segment ... Calculate the angle \(z\). The angle at the circumference in a semicircle is 90°.

Although this theorem was known in Babylon and India, Thales is believed to have been the first to prove it in a systematic fashion. His proof depended on assuming that the angles of any triangle ...

Learn about and revise the different angle properties of circles described by different circle theorems with this BBC Bitesize GCSE Maths OCR study guide.