1
x=3 y=-7 Hypotenuse = sqrt((-7)^2 +3^2)= sqrt(58) 7.616
sin = -7/sqrt58 =-7sqrt58/58
2
In quadrant II x is negative and y is positive they are equal magnitude because x+y = 0
tan = sin/cos = -1
3
reference angle is terminal side referenced to x- axis so pi/4