Protractor the UK. 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
Solid geometry a proof that the volume enclosed by a sphere is proportional to the cube of its radius. Basic topics in solid geometry and stereometry include Advanced topics include Various techniques and tools are used in solid geometry. Among them, analytic geometry and vector techniques have a major impact by allowing the systematic use of linear equations and matrix algebra, which are important for higher dimensions. A major application of solid geometry and stereometry is in computer graphics. Solid geometry In mathematics, solid geometry is the traditional name for the geometry of three-dimensional Euclidean space. Stereometry deals with the measurements of