Topics covered in this video: equilateral triangles, isosceles triangles, scalene triangles, equiangular triangles, right triangles, obtuse triangles, and acute triangles.

Originally released by Cerebellum Corporation, 2011. Streaming video file encoded with permission for digital streaming by Infobase on July 10, 2018.

World of Triangles: Definitions & Basic Facts (9:35); --Proving Triangles Congruent (9:39); -- Using Congruent Triangles (4:01); -- Credits: Triangles (1:08); .