Question

Use unit circle to determine sine, cosine and tangent functions of the angle 5pi/4

Answer 1

5pi/4 is located in quadrant III.
In Q III, sin and cos are negative, tan is positive.
T-bar for 5pi/4 is pi/4.
sin and cos are - (sqrt 2)/2
Tan is 1

Answer 2

Sin(5π/4)=o/h
cos(5π/4)=a/h
tan(5π/4)=o/a