Here's the previous diagram with the unit circle added back in. The values on the left show only the size of the segments, not the sign. In text boxes[icon]/images/ggb/toolbar/mode_text.png[/icon] below, list the values of sine, cosine, and tangent in each quadrant and for each multiple of 90°. Your choices are >0, <0, =1, =-1, =0, Ø (option+shift+O).[br][br]I've completed quadrant I and 0° as examples[br]