Ключевые слова: angles, blackboard, chalk, chalkboard, circular, degrees, design, designing, drafting, drawing, engineer, engineering, geometry, graduated, green, hand, horizontal, indoors, instrument, job, man, math, mathematics, measure, measurement, measuring, object, occupation, people, person, profession, professional, protractor, school, science, sketch, sketching, student, subject, teacher, technical, text, tool, using, word, work,