## JoãoVitorMC 2 years ago Consider the isosceles triangle with AB = AC. Suppose the angle bisector of B intersects the side AC at D and that BC = BD + AD. Determine the angle A.

1. JoãoVitorMC

|dw:1350605708301:dw|

2. CliffSedge

Wanna use trig, or regular plane geometry?

3. JoãoVitorMC

the easiest way to solve this

4. CliffSedge

I was looking at this last night. I'm trying to find my notes on it.

5. JoãoVitorMC

ok, i'm trying to solve this, but this one is really hard...

6. CliffSedge

Yeah, I'm trying combinations of law of cosines and law of sines.

7. JoãoVitorMC

but nothing yet

8. estudier

|dw:1350693786588:dw|

9. estudier

I will have to make a better drawing.....Answer s/b 100, I think....

10. estudier

|dw:1350694614179:dw|

11. JoãoVitorMC

what is "s/b 100"?

12. estudier

should be

13. JoãoVitorMC

ohh ok i got it

14. JoãoVitorMC

thank you so much!

15. estudier

yw:-)

16. JoãoVitorMC

hey where you get this 180° -5(Betha) = 4(Betha) ?

17. estudier

18. JoãoVitorMC

yes but i still don't see how to get 4 Beta...

19. estudier

look at triangle AED

20. estudier

For 180-5 Beta.

21. JoãoVitorMC

yes that i got

22. JoãoVitorMC

but them you set this equal to 4 beta, then i'm lost...

23. estudier

BD = BE so 4 Beta

24. JoãoVitorMC

ohhhh now i see

25. JoãoVitorMC

thank you soo much!

26. estudier

yw:-)