Ключевые слова: alignment, angle, arithmetic, background, banner, center, centimeter, circle, corner, degree, design, drawing, elbow, element, engine, geometry, graph, height, instrument, isolated, knee, knowledge, layout, leg, length, level, math, measurement, millimeter, mockup, postcard, poster, protractor, repair, rule, ruler, scale, school, science, setsquare, sketching, student, study, template, tool, trigonometry, university, white, width,