This document appears to be notes from a lesson on the Pythagorean theorem. It includes examples of perfect squares, evaluating square roots, estimating square roots, and the key terms and formula for the Pythagorean theorem (a2 + b2 = c2). Students are asked to fill in a graphic organizer on the theorem. Examples are given of using the theorem to find the length of diagonals of rectangles and checkerboards. The lesson concludes with demonstrating finding the diagonal of the classroom SMARTboard using the Pythagorean theorem.