1

Part of 2009 India Regional Mathematical Olympiad

Problems(1)

Find angle in isosceles triangle ABC

Source: (Indian) RMO 2009 Problem 1

ABC

be a triangle in which AB \equal{} AC and let

I

be its in-centre. Suppose BC \equal{} AB \plus{} AI. Find

\angle{BAC}

trigonometrygeometryangle bisectorperpendicular bisectorgeometry unsolved