Ключевые слова: angle, background, calculating, centimeter, circle, construction, degrees, design, development, diameter, divider, drafting, education, equipment, extensively, flat, graph, icon, illustration, instrument, isolated, map, marine, measure, measurement, military, millimeter, mils, nautical, naval, navigation, navigator protractor, ocean, orienteering, plotting, precision, protractor, radius, reading, ruler, scale, sea, stencil, symbol, tactical, tool, transparent, white, work,