Triangles and Polygons Identifying triangles by their angles and sides. Determining if a figure is a polygon. Lesson 2-4 and 2-5 Tools See a list of terms used in these activities. Matching Flashcards (Java / non-Java) Concentration Word Search Activities created by: Virginia Burlend This activity was created by a Quia Web subscriber. To learn how to make your own, just like this, click here.