Ключевые слова: 3d, area, circle, clock, contour, depth, design, diagonal, diameter, distance, education, engineering, equipment, geometry, hand, healthy, hour, icon, illustration, instrument, isolated, isometric, kilogram, level, line, linear, measure, measurement, meter, outline, radius, red, round, ruler, scale, set, sign, size, technology, time, timer, tool, watch, water, weight, width,