## anonymous one year ago suppose angle B=60 degrees, and length of b=2

1. anonymous

2. hartnn

what have you tried? :)

3. anonymous

angle a is 30 degrees

4. anonymous

which means b is 60 degrees

5. hartnn

A=30 is correct, B = 60 is given, go on

6. anonymous

tan30=a/2

7. anonymous

2*tan(30)=a/2

8. hartnn

a =2 tan 30

9. anonymous

which is 1.15 which is just 1

10. anonymous

they want the exact measures

11. hartnn

since we are not allowed decimals, whats tan 30 in fraction ?

12. anonymous

1/sqrt3

13. hartnn

or lets try to get 'c' first using sin B

14. hartnn

ok, thats correct, so a = 2/\sqrt 3

15. hartnn

$$a= \dfrac{2}{\sqrt 3 }$$

16. anonymous

so sin60=2/c, 2*sin60,

17. anonymous

sin of 60 degrees is sort(3)/2

18. anonymous

sqrt*

19. hartnn

yes sqrt 3/2 = 2/c so c = 2*2/ sqrt 3 = ...

20. anonymous

4/sqrt(3)

21. hartnn

$$\huge \checkmark$$

22. anonymous

so basically we are transforming the degrees into the coordinates of either sin or cos .. i'm slow :)

23. hartnn

i didn't get that :P we are trying to find the missing angles and sides of a triangles using sin/cos/tan ....

24. anonymous

but every coordinate on the unit circle has either a sin and cos.. just clarifying :D

25. hartnn

yes, that is true!