Sine, Cosine and Tangent Ratios

Sides of a Right Angled Triangle

The order in which the names of the sides are determined is listed below:

-The longest side of the triangle is called the Hypotenuse.

-The side opposite to the angle under consideration, in this case A, is called the Opposite.

-The remaining side is called the Adjacent.

Note: the Opposite side is always the side opposite to the angle under consideration.

Sine (Sin) Ratio

The sine of an angle is the ratio of the opposite side, to the hypotenuse side.

That is,                  Sin ϴ      =             

Cosine (Cos) Ratio

The cosine of an angle is the ratio of the adjacent side, to the hypotenuse side.

That is,                  Cos ϴ    =      

Tangent Ratio

The tangent of an angle is the ratio of the opposite side, to the adjacent side.

That is,                  Tan ϴ    =