Students are learning about different types of triangles. In the classroom, there is a poster on the wall that shows several types of triangles (e.g. isosceles, equilateral, scalene). Each type of triangle is labeled with distinguishing characteristics. For example, the isosceles triangle is shown to have two sides of equivalent lengths (see diagram above, tick marks) and two angles that are equivalent (see diagram above, angles are labeled as congruent). Following teacher instruction, using the information outlined on the labeled diagram, students practice measuring the side lengths and angles of a different assigned triangle to identify the type.