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# find watch

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1. ABC triangle BD bisects ∠ABC, D on AC, m∠ABC =80 , AD=BD+BC
find m∠C
2. Although this problem is not well presented it was interesting.

I haven't a clue what the m is supposed to mean so I ignored it.

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Why should I tell you?
3. is m some sort of constant?

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if m was just a typo, and

Let BC = x, and BD = y, and so AD = x+y.
Let

Draw a good diagram. Try using sine rule in triangles BCD and ABD.
4. Have you solved it?

If so do you agree that triangle ABC is isosceles?
5. In america, m∠ means the measure of an angle
6. Try using sine rule in triangles BCD and ABD.

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Updated: March 25, 2009
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