Ключевые слова: angle, art, background, black, centimeter, design, drafting, draw, drawing, education, element, engineering, equipment, flat, geometric, geometry, graphic, icon, illustration, inch, instrument, isolated, length, line, math, mathematics, measure, measurement, millimeter, number, object, office, plastic, protractor, rule, ruler, scale, school, science, set, sign, silhouette, student, supplies, symbol, tool, triangle, triangular, white,