Bearded Math Teacher Pointing His Stick at a Triangle

A smiling teacher with glasses, a beard, and a tie stands in front of a big classroom chalkboard and points a long stick at a triangle. The triangle has its sides labeled a, b, and c. Next to it on the board is a right triangle, also labeled a, b, and c, with a small angle mark in the corner, plus a plain rectangle. Three students sit at desks in the foreground, seen from behind or the side. One has short hair and rests a hand on the desk, one wears pigtails with a collar, and one is partly cut off at the edge. A good way to use this page is to color each triangle side a different color, then match the letters on both triangles. This free printable also works well as a warm-up before a lesson on shapes or the Pythagorean theorem.