This app is intended to visualize how the area of a triangle [math]A=\frac{1}{2}bh[/math] can be transformed into half the area of a rectangle with the same base and height.[br][br]The shape of the triangle can be changed by:[br]Dragging point B[br]Dragging point C[br]Selecting side AB as the base and adjusting the height with the point labeled height. [br][br]To change the which side of the triangle is referenced as the base, use the checkboxes. [br]Click on animate to watch the transformations in action!

Point C is on a ray parallel to line AB extending to the right. Extending C to the right of A would just be a reflection across the line x=x(A).