Ключевые слова: 3d, background, blue, button, centimeter, circle, concept, corner, creative, design, dimension, drawing, education, element, equipment, flat, frame, geometric, icon, illustration, inch, instrument, isolated, isometric, length, line, mark, math, measure, measurement, meter, object, rule, ruler, scale, scheme, school, shape, sign, simple, size, square, stamp, straightedge, symbol, tool, triangular, web, white,