CoolMath's Brain Bender games include several interactive triangle games. The Penny Triangle game challenges players to flip the direction of a triangle made of pennies by moving only three pennies. How Many Triangles is a game that asks players to find as many triangles as they can within a shape and also offers hints and the solution. Pascal's Triangle is a classic game that prompts players to figure out number patterns within a triangular shape.
The National Library of Virtual Manipulatives has interactive triangle games on its site, such as the Congruent Triangles game, which allows players to create new triangles from smaller triangle combinations. Pinwheel Tiling is a game on this site that allows players to create an unusual tiling of right angles in a pinwheel fashion. and the Pythagorean Theorem game includes two puzzles that illustrate the proof of the Pythagorean Theorem. There is also a Right Angle Solver game, which solves for unknown sides and angles of right triangles, and a Triangle Solver game, which uses the laws of sines and cosines to solve unknown angles and sides of triangles.
AplusMath has a geometry bingo game called Matho, which displays a geometry term and players then choose the image on a virtual bingo card that most closely resembles the term, such as equilateral triangle or obtuse triangle. When correct answers are chosen, the squares are covered until a bingo is achieved. This site also has a hidden picture game, which requires players to answer geometry and triangle questions correctly to reveal a picture underneath.
Quia has a simulated TV game show called Rags to Riches, which quizzes students on triangle and angle topics; there are also triangle matching games, Concentration and online word search puzzles. Quizlet offers more than 400 interactive triangle flashcard sets and worksheets with audio, which can also be printed with solution sheets. Customizable quizzes are also available with each flashcard set, allowing for true-or-false, multiple-choice, written or matching answers. Quizlet also allows users to create their own flashcard sets.