Ключевые слова: 3d, achievement, angle, art, background, blank, board, ceremony, chalk, chalkboard, circle, class, classroom, contour, degree, education, empty, flat, frame, geometry, graduate, graduation, green, grid, hat, icon, illustration, instrument, isolated, isometric, line, linear, lineart, measure, measurement, object, outline, round, ruler, school, set, sign, symbol, tilt, tool, university,