# Summary

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**In this chapter, you have studied the following points :**

**1.** In a right triangle ABC, right-angled at B:

sin A =

cos A =

tan A =

**2.** cosec A =

sec A =

cot A =

tan A =

**3.** If one of the trigonometric ratios of an acute angle is known, the remaining trigonometric ratios of the angle can be easily determined.

**4.** The values of trigonometric ratios for angles 0°, 30°, 45°,

**5.** The value of sin A or cos A never exceeds 1, whereas the value of sec A or cosec A is always greater than or equal to

**6.**