- #1

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## Homework Statement

Please see below...

## Homework Equations

Please see below...

## The Attempt at a Solution

Hi. This question is on geometry with circle and triangle. I am stuck only on 2 parts of the solution and not the whole solution...

Thank you....

http://img256.imageshack.us/img256/9475/gtewp249no24.jpg [Broken]

[ How did they get this? They never explained or proved this and it is NOT obvious from the picture.

Blue: How is that implication true? By what theorem or reasoning?

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