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Area of inscribed triangle
This more advanced (and very optional) tutorial is fun to look at for enrichment. It builds to figuring out the formula for the area of a triangle inscribed in a circle!
More on the difference between a theorem and axiom. Proving a cool result using SSS
Simple proof using RSH postulate to show that a radius perpendicular to a chord bisects it
Problem that requires us to figure out the area of an equilateral triangle inscribed in a circle (A little trigonometry used)