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ARITHMETIC PROGRESSION PYQS
CHAPTER 8 Trigonometry
Trigonometry To find the distances and heights we can use the mathematical techniques, which come under the Trigonometry . It shows the relationship between the sides and the angles of the triangle. Generally, it is used in the case of a right angle triangle. Trigonometric Ratios In a right angle triangle, the ratio of its side and the acute angles is the trigonometric ratios of the angles. In this right angle triangle ∠B = 90°. If we take ∠A as acute angle then - AB is the base , as the side adjacent to the acute angle. BC is the perpendicular , as the side opposite to the acute angle. Ac is the hypotenuse , as the side opposite to the right angle. Trigonometric ratios with respect to ∠A Ratio Formula Short form Value sin A P/H BC/AC cos A B/H AB/AC tan A P/B BC/AB cosec A H/P AC/BC sec A H/B AC/AB cot A B/P AB/BC Remark If we take ∠C as acute angle then BC will be base and AB will be perpendicular. Hypotenuse remains the same i.e. AC.So the ratios will be accor...
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