This is a unit circle that gives the value of sine and cosine of angle DAC where FG is sine and AG is cosine because the line AF equals 1 which is the hypotenuse of the circle.

1) Find the sine and cosine of 45°?
2) What is similar about these things? Why?
3) Find the sine and cosine of 30°?
4) Find the sine and cosine of 60°?
5) What is similar about the sine of 30° and the cosine of 60°?
6) What is similar about the sine of 60° and the cosine of 30°?
7) What is similar about the sums of the angle measures of the equal units?