1.

A State Thales theorem (Basic proportionallytheorem) and prove it.

Answer»

Ingeometry,Thales's theoremstates that if A, B, and C are distinct points on acirclewhere the lineACis adiameter, then theangle∠ABC is aright angle. Thales's theorem is a special case of theinscribed angle theorem, and is mentioned and proved as part of the 31st proposition, in the third book ofEuclid'sElements.It is generally attributed toThales of Miletus, who is said to have offered anox(probably to the godApollo) as a sacrifice of thanksgiving for the discovery, but sometimes it is attributed toPythagoras.



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