The Unit Circle

Today we learned about the "Unit Circle" A Unit Circle is the circle with its center at the origin and with a radius of one unit.
The Equation for the Unit Circle is x² + y² = 1
The standard position starts at (1, 0)

We learned the notation P(θ) which is used to denote the terminal point. (SOH CAH TOA)
It can be defined it as P(θ) = (x, y) = (Cosθ, Sinθ)
Equation: x² + y² = 1 or Cos²θ + Sin²θ = 1
y - axis (Sin) X - axis (Cos)

We also learned how to solve problems by simplifying and identifying the sign of the trig functions in each quadrant. (hint: CAST Rule)