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.
Bearings are three figure angles measured clockwise from North ... Circles, sectors and arcs - Edexcel The circumference of a circle is its outside edge, and is the same distance from the centre ...
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