Ключевые слова: angle, architecture, background, blue, business, centimeter, circle, closeup, color, colored, construction, design, drawing, education, equipment, geometric, geometry, green, group, image, inch, industry, instrument, isolated, isolatedbackground, mathematical, measurement, millimeter, nobody, number, object, office, plastic, protractor, red, ruler, school, science, set, shape, sketching, square, supplies, symbol, technology, tool, triangle, white, wood, work,