(Below is just the first step of the lesson. For the full lesson and directions, see attachments)
Step One: Marking the Triangle
Find a straight line in which to mark the base of your triangle. (Use a wall as your guide, find an existing line such as found in a parking lot if outside, etc.) If existing lines are not available, mark off a right triangle on the ground using the tape measure and a corner. It is very important that the right angle is accurate.