The Unit Circle

Hello, this is Harry Kainth, our lessons from the past two classes have been about the unit circle.

The equation of a unit circle is x^2 +y^2 = 1, another way to look at it is cos^2 θ + sin^2 θ = 1.

sorry I couldn't find any nice pictures like Stefan did.

We learned that the notation P(θ) denotes the terminal point. The terminal point is where the terminal arm of the angle θ intercepts the unit circle.

We solved questions where we were given the value of cosθ and had to find the values of sinθ and tanθ, also where we had the value of y and had to find the value of x and tanθ.

We also began learning about Special Angles and the Trigonometric Functions, which is about determining the exact values of trig. ratios for any multiples of 0°, 30°, 45°, 60° and 90°, and also 0, π/6, π/4, π/3 and π/2.

We were assigned a Unit Circle worksheet and questions from the exercise book to complete for tomorrows class.