Students come in and complete bell work posted on board.
Explain the unit of measurement we will be using, which is the distance between pegs on the board, referred to as one unit. Check for student understanding of length by constructing horizontal and vertical line segments and having students determine length. Have students estimate length of diagonal segments. Relate Pythagorean theorem to right triangles if the class is ready. Use calculators if class is ready to derive irrational square roots for hypotenuses.