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.
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Two American Teenage Girls Challenge 2,000 Years of Mathematics with a Groundbreaking Proof of Pythagoras’ TheoremA trigonometric proof that bypasses the traditional foundations of sine and cosine, removing any dependency on Pythagoras’ ...
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