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The word trigonometry is originated from the greek word ‘tri’ means three, ‘gonia’ means angle and “metron” means measure. Hence the word trigonometry means three angle measure i.e. it is the study of geometrical figures which have three angles i.e. triangle.Do solve NCERT text book for class 10 maths with the help of Physics Wallah NCERT solutions for class 10 maths.