Ключевые слова: abstract, activity, addition, analysis, background, business, circle, circular, concept, data, design, diagram, education, educational, element, equivalent, fraction, geometric, graphic, growth, half, ideas, isolated, line, math, number, one, percentage, pie, pie chart, piece, planning, process, quarter, report, representation, round, school, section, segment mathematics, set, shape, slices, strategy, symbol, target, third,