jjuden one year ago What is the length of side AB if AC is 5 sqrt 2?

1. jjuden

2. Nnesha

$\rm sin \rm \theta = \frac{ opposite }{ hypotenuse }~~~~ \cos \theta = \frac{ adjacent }{ hypotenuse } ~~\tan \theta = \frac{ opposite }{ adjacent }$

3. Nnesha

|dw:1433786987097:dw| to find length of side AB you should know one angle and one side so which function you should use sin ,cos or tan ??

4. jjuden

i dont know

5. Nnesha

|dw:1433787161426:dw| you should use cos which is equal =adjacent over hyp $\huge\rm cos 45 = \frac{ x }{ 5\sqrt{2} }$ solve for x

6. jjuden

@paki

7. Nnesha

what part u didn't understand ???