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Trigonometric Ratios of 30° and 60°

Trigonometric Ratios of 30°
In this section, we shall deal with the trigonometric ratios of 0° , 30° , 45° , 60° , 90° .

Let ABC be an equilateral triangle. Its each angle is of 60° and the bisector of each angle will be of 30°.


Let the side of the triangle be a

In this figure, D is the mid-point of BC, hence BD = CD = .

In Δ ABD,

AD2 = AB2 - BD2

In Δ ABD,

Trigonometric Ratios of 60°

From the previous figure, in Δ ABD,





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