Discovering Trigonometric Ratios

Use the slider to change the measure of angle A. Use point B to change the size of the triangle? What do you notice? What do you wonder?
If you are having trouble with finding questions to ask: Is there a way to change the triangle, but keep the ratios the same? What happens when you change the angle? When you move point B? Why these three ratios? Can you make a triangle that is the same triangle as a classmates? Can you do it with a different measure of angle A?