Prove theorem: To two circles tangent externally at a point A, a common external tangent BC is drawn(where B and C are the tangency points). Prove that the angle BAC is right.

hexacordoK 2021-08-14 Answered
Prove theorem: To two circles tangent externally at a point A, a common external tangent BC is drawn(where B and C are the tangency points). Prove that the angle BAC is right.
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Alix Ortiz
Answered 2021-08-15 Author has 18712 answers

Prooving the theorem:
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