I have been making videos to use in class, so the blog is going to be videos of me teaching. If you have related questions, post your questions in the comment section. I will do my best to answer you in a timely manner. This geometry video math lesson develops the area of a triangle from the area of a parallelogram. Grid or graph paper, a pencil and a straight edge will be necessary if you want to complete the task yourself. If you want to really make the connection between the heights of the parallelogram and the triangle, you should create your own triangle with a different base and height. To use this as a hands on tactile geometry lesson, download grid paper here.

The connection is made through the heights of the the objects. The height of the parallelogram is one half the height of the triangle. To use this as a hands on tactile geometry lesson, download grid paper here.