Hi all, I'm looking for a simple prgoram to simulate geometric shapes, angles, areas, lengths and so on. I remember using one like this in highschool I just can't remember the name. For example, we could take a circle, select a point on it, start to rotate and graph a sine wave with respect to angle for example. Or draw a triangle, move any 3 corners and display area, perimeter, angles dynamically. Any ideas? Thanks a lot.