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Trigonometry The Word 'trigonometry' is derived from the Greek words 'tri' (meaning tree), 'gon' (meaning sides) and 'metron' (meaning measure). In fact trigonometry is the study of relationship between the sides and angle o the triangle. In This chapter, we will study some ration of the sides of a right triangle with respect to its acute angles, called trigonometric ratios of the angle. We will restrict our discussion to acute angle only. However, these ratios can be extended to other angles also. We will also define the trigonometric rations for angles of measure 0 o and 90 o . We will calculate trigonometric ratios for some specific angles and establish some identities involving these rations, called trigonometric identities. Trigonometricration Let us take a right triangle ABC as shown in Here   CAB (or, in brief, angle A) is an acute angle. Note the position of the side BC with respect to angle A. If faces   A. we ca...