Provides viewers with an introduction to key concepts involved with angles, such as how to define and write information about an angle, mathematical notation for rays, line segments, and lines, and how to use a protractor. Illustrates obtuse and acute angles; investigates the relationships between the angles formed by transversal crossing parallel lines; and introduces congruent triangles by using examples from real life, supplemented by clear graphic overlays and simple animations. Accessibility options on the DVD are: (1) expanded description, (2) English subtitles in a black box, (3) subtitled description. Part of the "Mathemania" series.
easy to reach learners and reinforce concepts
Excellent and very clear!