## anonymous one year ago Suppose you start at the point(1,0) on a unit circle and move a distance t=3.5 along the circle. What is the reference number for t?

1. Jhannybean

|dw:1443954591287:dw| So we're starting off at $$P (1,0)$$ and we're looking for $$\mathbf {\overline t}$$

2. Jhannybean

To do that, we're simply going to subtract the distance, $$\mathbf t = 3.5$$ by $$2\pi$$ to find $$\mathbf{\overline t}$$

3. Jhannybean

$\overline t = 2\pi - 3.5 =~?$ This is what you call the reference number.

4. anonymous

would you simply multiply 2(3.14)-3.5?

5. anonymous

I got 2.7

6. Jhannybean

Yeah but I wouldn't limit it to 3.14 unless specifically asked for, it gives an inaccurate reading and the reference number is simply an approximation.

7. Jhannybean

so $$\overline t \approx 2.78$$

8. anonymous

thank you so much! You literally saved me. I have a quick question about trigonometry and right angles. I know all the angles but don't know any of the sides

9. Jhannybean

Youre not really giving me any answer choices to work with so I can check whether my solution matches up to any of the choices.

10. anonymous

oh there are no answer choices. I'm taking an online program called wamap. I just have to input my answer and see if it's right or not

11. Jhannybean

This is not a quiz is it?

12. anonymous

no it's not it's homework in preparation for the quiz.

13. Jhannybean

Okay.

14. Jhannybean

Here is a website that will help you understand more about reference numbers, just scroll down. http://cims.nyu.edu/~kiryl/Precalculus/Section_5.1-The%20Unit%20Circle/The%20Unit%20Circle.pdf

15. anonymous

I actually own that book :) and it doesn't really mention anything about finding unknown sides