Protractor Protractor A protractor is a measuring instrument, typically made of transparent plastic or glass, for measuring angles. Most protractors measure angles in degrees (°). Radian-scale protractors measure angles in radians. Most protractors are divided into 180 equal parts. Some precision protractors further divide degrees into arcminutes. They are used for a variety of mechanical and engineering-related applications. One common use is in geometry lessons in schools. Some protractors are simple half-discs. More advanced protractors, such as the bevel protractor, have one or two swinging arms, which can be used to help measure the angle. A bevel protractor is a graduated
BASIC A+ a supplement to the latter's reference manual as its documentation. In addition to being faster than its ROM-bound counterpart, BASIC A+ provided a number of extra commands for DOS operations, player/missile graphics, and debugging. BASIC A+ BASIC A+ was developed by Optimized Systems Software of Cupertino, California, United States, to provide the Atari 8-bit family with an extended BASIC compatible with, but faster than, the simpler ROM-based Atari BASIC. While Atari BASIC came on an 8 KB ROM cartridge, BASIC A+ was delivered on floppy disk and took 15 KB of the computer's RAM, leaving 23 KB available for user