Ключевые слова: axis, background, circle, concept, design, development, discipline, doodle, drawing, education, element, emblem, equation, formula, geometry, homework, icon, illustration, instrument, isolated, knowledge, learning, math, mathematical, mathematics, monochrome, nobody, object, root, ruler, school, schooling, science, seminar, sign, simple, square, studying, symbol, task, theory, training, triangle, trigonometric, trigonometry, variable, web,