How to Classify Triangles by Sides and Angles

Math Songs by NUMBEROCK

A high-energy, musical educational animation that teaches students how to classify triangles based on their sides and angles. Through a catchy rock song, the video introduces key geometry vocabulary including isosceles, scalene, equilateral, acute, obtuse, and right triangles, while also reinforcing the concept that the sum of interior angles in any triangle equals 180 degrees. The content breaks down classification into clear sections: first connecting side lengths to visual metaphors (like mountains and road signs), then examining angle measurements within those same shapes. It visually demonstrates the angle sum theorem by animating the angles of a triangle coming together to form a straight line (semicircle). This video is an excellent resource for 3rd through 5th-grade math classrooms. It serves as an engaging hook to introduce geometry units or a memorable review tool. Teachers can use the song's real-world examples—such as boat sails, skateboard ramps, and billiard racks—to help students recognize geometric shapes in their environment.