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Ключевые слова:
abstract, accuracy, angle, background, black, centimeter, closeup, concrete, detail, drawing, education, equipment, flat, geometry, instrument, isolated, length, line, long, marking, mathematical, mathematics, measure, measurement, metric, millimeter, number, numbers, object, office, pattern, plastic, precise, protractor, row, rule, ruler, school, side, space, straight, straightedge, student, surface, symbol, texture, tool, width, work, yellow,