All six trigonometric ratios can be illustrated on the "Unit Circle" - a circle of radius = 1. The hypotenuse of a right-angled triangle (draw here in yellow) has a fixed length of 1, while the the length of the trig ratios are drawn in size proportional to the hypotenuse. The colors are as follows: light blue = sine purple = cosine dark red = tangent dark green = cosecant orange = secant light green = cotangent Move the mouse pointer around the circle. Press "H" to hide/unhide" screen variables. The var in the bottom-right corner (direction) allows you to choose between the Scratch or Standard angle direction.
sin = sine = opposite/hypotenuse cos = cosine = adjacent/hypotenuse tan = tangent = opposite/adjacent csc = cosecant = hypotenuse/opposite sec = secant = hypotenuse/adjacent cot = cotangent = adjacent/opposite Also, as well as the source project, I'd like to thank @papipupepappa (and a few others) for the inspiration I got from similar projects. Update Nov.26, 2023: added 2nd angle direction system.
