Ключевые слова: accuracy, angle, background, centimeters, chalk, chalkboard, closeup, college, color, copy, degrees, design, drafting, drawing, education, engineering, equipment, geometry, green, instrument, knowledge, learn, length, line, markings, math, mathematical, mathematics, measure, measurement, measuring, millimeter, nobody, number, object, precision, protractor, ruler, school, science, shape, space, stationery, supply, text, yellow,