Study of a Triangle Book - This material illustrates and describes 12 parts of a triangle: sides, angle, vertex, base, perimeter, area, altitude, median, axis, orthocenter, centroid, and circumcenter.Includes:book cover14 picture cards14 description cardsThere are two styles of books included. Style one is approx. 3¾" x 5", style two is approx. 5½” x 5½“ and requires little preparation.You may also be interested in the following:The Study of a Triangle 3-Part CardsFundamental Concepts of Geometr