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