You could start with the unit circle.
Yes, the Unit Circle helps, but it also helps to have the special triangles on hand so you can find the trig functions of the focus angles.
Draw a right angled isosceles triangle with the identical sides = 1 unit in length. Clearly its angles are .
By Pythagoras, the hypotenuse is units in length.
What are and ?
Then draw an equilateral triangle of side length 2 units. Draw a perpendicular bisector, then you have two triangles. Their side lengths are units (check using Pythagoras).
What are and ?