Graph the unit circle using parametric equations with your calculator set to degree mode. Use a scale of 5. Trace the circle to find all values of t between 0° and 360° satisfying the statement.
A)125°, 305°
B)140°, 315°
C)140°, 310°
D)135°, 310°
E)135°, 315°

Question

Graph the unit circle using parametric equations with your calculator set to degree mode. Use a scale of 5. Trace the circle to find all values of t between 0° and 360° satisfying the statement.  ​
A)125°, 305° 
B)140°, 315° 
C)140°, 310° 
D)135°, 310° 
E)135°, 315°

Quizplus · Accepted Answer

Using the parametric equations $x=5\cos(t)$ and $y=5\sin(t)$ in degree mode, we can graph the unit circle:

![unit circle graph]({{site.baseurl}}/assets/images/unit_circle_graph.png)

Using the trace function, we can see that the points that satisfy the statement are located at approximately t = 125° and t = 315°, which correspond to answers E, $\boxed{	extbf{E}}$.

Graph the Unit Circle Using Parametric Equations with Your Calculator