Question 560953
a radian is the size of a central angle of a circle that subtends a circumferential arc that is the length of the radius


in English ___ if you cut a piece of pie (not pi) and the outer arc of the crust is the same length as the radius of the pie
___ then the angle of the point of the piece is one radian


since the circumference of a circle is 2*pi*r; 360º (a whole circle) equals 2pi radians


in your case, -5pi/6 is a negative angle of ___ (-5pi / 6)(360º / 2pi) or -150º