Ключевые слова: accuracy, angle, app, architect, architecture, background, black, button, circle, concept, corner, design, drawing, education, equipment, frame, geometric, geometry, graphic, icon, illustration, instrument, isolated, learning, length, line, logogram, math, measure, measurement, object, office, outline, pictogram, protractor, ruler, scale, school, shape, sign, solid, straightedge, symbol, tool, university, web, white, work,