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Blackboard with math and science by writing on the blackboard. Complex math formulas on whiteboard. Mathematics and science with economics Library Protractor. Protractor grid for measuring degrees. Tilt angle meter. Measuring tool. AI10 Archimedean spiral on white background. Three turnings of one arm of an arithmetic spiral, rotating with constant angular velocity. Red spiral is represented on a polar graph. Illustration. Vector. Hand drawn science on paper Clock face. Measuring circle scale. Measuring round scale, Level indicator, measurement acceleration, circular meter, round meter for household appliances. 12 large divisions, 60 medium. Vector AI10 The universe within. Silhouette of a man inside the universe, physical and mathematical formulas.. The concept on scientific and philosophical topics. Elements of this image furnished by NASA. The concept of the human brain. The right creative hemisphere versus the left logical hemisphere. Education, science and medical abstract background. wise man writing mathematical problem solution Numbers Electronic calculator