Answer:
f42 is answer plz mark as brainlist
Step-by-step explanation:
Answer: 
Step-by-step explanation:
For this exercise you must use the followinG Trigonometric Identity:

In this case, given the right triangle PQR, you can identify that:

Then, the next step is to substitute those values into
:

And the final step is to solve for "QR" in order to find its value.
So you get that this is:

6 because 4 is lower than 5 so then you need to give it a rest