Editing ThalesTheorem
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[[[> IMG:ThalesTheorem.gif ]]] Thales is credited with Thales' Theorem, which states that in a circle, the diameter always subtends a right angle from the circumference. A generalisation of Thales' Theorem says that the angle subtended at the centre of a circle by a chord is exactly double the angle subtended at the circumference. Relatively easy to prove, it nonetheless forms the basis of a method of computing one's position from a collection of relative bearings. ---- CategoryMaths