Introduction to the Unit Circle

The x value on the unit circle is defined by which function?

The y value on the unit circle is defined by which function?

Why do we want to think of trig functions instead of triangle trig when we start looking at the unit circle?

Estimate the value of $$\theta$$  

What is this jawnski called?

(a)  

Match the following vocabulary related to the Unit Circle

What is the radius of a unit circle?

What is the radius of the unit circle?

Unlike right triangle trigonometry, sine and cosine may be negative. Thinking about how sine, cosine, and tangent relate to (x,y) coordinate pairs on the unit circle, find the quadrants where: cosine is positive: ​ (a)   ​& (b)   cosine is negative: ​ ​ (c)   &​ (d)  

Which point on the unit circle corresponds to an angle of $$\frac{7\pi}{6}$$ radians?