Ключевые слова: angle, background, black, blackboard, calculator, centimeter, chalk, chalkboard, college, color, composition, degrees, design, drafting, drawing, education, engineering, equipment, flat, geometry, item, knowledge, lay, learning, length, line, many, marker, markings, math, mathematics, measure, measuring, number, object, protractor, ruler, school, scissors, shape, stationery, study, supplies, table, teach, tool, top, university, view, work,