More simply, the angle at the centre is double the angle at the circumference. Angle OGH (\(y\)) = angle OHG because triangle GOH is also isosceles. Lengths OH and OG are also both radii.

Circle theorems - Higher - Edexcel Circles have different angle properties described by different circle theorems. Circle theorems are used in geometric proofs and to calculate angles ...

Two students who discovered a seemingly impossible proof to the Pythagorean theorem in 2022 have wowed the math community ...