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**tony123****Member**- Registered: 2007-08-03
- Posts: 222

In an acute-angled triangle ABC, a tangent is drawn to the inscribed circle, parallel to side BC. The tangent intersects side AC at point D. F is the orthogonal projection of point D onto the side BC. Show that AB=AD+BF

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**Bob****Administrator**- Registered: 2010-06-20
- Posts: 9,635

hi tony123

Thanks for another interesting puzzle.

Bob

Children are not defined by school ...........The Fonz

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

Sometimes I deliberately make mistakes, just to test you! …………….Bob

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