- Atari 2600: Robot Tank (archive.org)
Robot Tank is a 1983 video game for the Atari 2600. It was designed and programmed by Alan Miller and published by the then-fledgling Activision. The game has the player remotely control a futuristic robot tank, whose mission is to stop enemy rebel tanks rampaging across the countryside from reaching downtown Santa Clara, California, United States. The tank is equipped with radar to locate enemy squadrons.
- Quadrilateral (Wikipedia)
In geometry a quadrilateral is a four-sided polygon, having four edges (sides) and four corners (vertices). The word is derived from the Latin words quadri, a variant of four, and latus, meaning “side”. It is also called a tetragon, derived from greek “tetra” meaning “four” and “gon” meaning “corner” or “angle”, in analogy to other polygons (e.g. pentagon). Since “gon” means “angle”, it is analogously called a quadrangle, or 4-angle. A quadrilateral with vertices A, B, C and D is sometimes denoted as ABCD.