Ключевые слова: accessory, background, blue, centimetre, closeup, color, colorful, construction, copy, different, distance, education, engineering, equipment, flat, geometric, geometry, knowledge, lay, learn, length, many, math, mathematics, measure, measurement, measuring, meter, modern, nobody, object, office, pattern, plastic, ruler, rulers, school, size, space, stationery, student, study, subject, supplies, task, text, tool, top, view, wooden,