Triangle TilingDrag triangles into place to make patterns. You can rotate a triangle by 180 degrees by clicking on it. Can you make a pattern that has parallel lines in it? Can you make a pattern that has vertical angles in it? Can you show that the internal angles of the triangle add up to 180 degrees? Can you make a similar triangle with sides that are twice as long as the sides of the tiling triangle? Is it twice as big? 

Leone Learning Systems, Inc. (LLS) is a North Shore company that provides online courses for kids anywhere and local teaching and tutoring services for students in Chicago and the Northern Suburbs of Chicagoland. LLS also provides a free geometry software package for children age 6 and up, and free resources for teachers and parents. This site includes information about classes taught, availability for tutoring, learning activities for kids, lesson plans, and ongoing software and curriculum research and development efforts. 