The question I have is:
Given that , and , find the exact value of the angle in radians. Justify your answer.
Is the following along the right lines?
Since both and are negative and lie in the range , then must lie in the 2nd quadrant so is positive.
Thanks for your help
Thank you for such a quick reply! So does the angle ? Can I then justify this answer by explaining what you have written? Why do I need to know the lenths of the sides in the right angle traingle to find the exact value of the angle in rtadians? Sorry if this seems like a really stupid question.