Trigonometry (Note-1)

Pythogoras theorem :

In a right- angled triangle, the square of hypotenuse is sum of the squares of the base and the perpendicular.

Trigonometric Ratios:-

The ratios of the sides of a right-angled triangle with respect to its angles are called trigonometric ratios.

                                                                                    Trigonometric Ratios of certain Angles

Trigonometric Ratio of 30°

Note : if in a right- angled triangle, one angle is 30°, then the side opposite to it is half of the hypotenuse.