[color=#000000]Play around with the triangles for a minute. [br][br]You can change the dimensions of the triangle by dragging the white dots on each of the angles.[br][br]You can see what happens when you put all the angles next to each other by clicking on 'slide me' and sliding it![br][/color]
When you change one of the angles by dragging it, what happens to the other 2 angles?
Click on slide me so the angles move next to each other. [br][br]What do you notice about what they look like when they're next to each other?
All together the 3 angles make a straight line.
Change the triangle by dragging the white dots on the angles around. [br][br]Then click on 'slide me' again to move the angles next to each other.[br][br]What do you notice now?
The 3 angles always make a straight line when they're put next to each other.