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