Ключевые слова: background, centimeter, concept, corner, creative, design, dimension, drawing, dynamic, education, element, equipment, flat, frame, geometric, icon, illustration, inch, instrument, isolated, length, line, mark, math, measure, measurement, meter, object, random, rule, ruler, scale, scheme, school, shape, sign, simple, size, square, stamp, straightedge, symbol, tool, triangular, web,