Ключевые слова: back to measure, back to school, basic, beard, bearded, blackboard, classroom, copy space, corner, disciplines, education, elementary school, engineering, exam, formal, formula, geometric, happy, high, holding, illustration, learning, lesson, male, man, math, mathematics, mature, measurement, pass, pattern, prepare, problem, ruler, school, scientific, shapes, sign, size, sphere, stationery, stem, student, studying, subject, teacher, tool, triangle, using, work,