1. ## missing angle

hi, can you check if im right when trying to find the missing angle of this shape?

to work this out i did this:

inverse tan 7/11= 7.44???

is this correct? if not where am i going wrong?

thanks!

2. how did you calculate $\displaystyle tan^{-1}(7/11)$ (and state whether radians or degrees)

3. on my calculator i just wrote " tan^-1 7/11= 7.44

my calculator is in degrees!

4. Your calculator, due to the lack of parentheses, computed $\displaystyle \tan^{-1}(7)/11,$ not $\displaystyle \tan^{-1}(7/11).$ Try that again, and see what you get. This is what BAdhi was getting at, I think. Incidentally, you were right to doubt the correctness of the result. You should always have a rough idea of what a calculator is going to give you.

5. okay, so i nned to do $\displaystyle \tan^{-1}(7)/11,$ = 32.47??

6. Right answer, wrong typing. You should have

$\displaystyle \tan^{-1}(7/11)\approx 32.47^{\circ}.$

7. Some models require the argument first. If this is the case type $\displaystyle 7 \div 11$ and then inverse tan button