Ключевые слова: accuracy, angle, background, centimeter, color, construction, design, designer, drawing, education, engineering, equipment, flat, geometric, geometry, green, group, horizontal, instrument, isolated, length, mathematical, measurement, measuring, meter, millimeter, nobody, number, objects, office, plastic, protractor, red, ruler, scale, school, set, shape, supplies, tool, transparent, triangle, white, work, yardstick, yellow,