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ing an angle and "Metron" meaning "measure". Thus the word "Trigonometry" means three SYNOPSIS * The word Trigonometry is derived from the Greek word "Tri" meaning "three", "Gonia" mean- angle measure and hence the literal meaning, the measurement of a triangle. Trigonometry is the part of mathematics which deals with relation between the sides and ples of a gle with help of a right angled triangle to determine unknown heights and distances id in navigation engineering, astronomy and surveying. An angle is the union of two rays (sides), with common end point 'O' together with the rotation in the plane necessary to bring one ray in the position of the ray. * If the rotation is anti-clockwise, the angle regarded as positive, and if clockwise, the angle regarded as negative. B А А (anti-clockwise) (clockwise) (-ve) (-ve) * Measurement of angles : or British system: If a rotation from the initial side to the terminal​

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