Sin.. Cos.. Tan.. TRIGONOMETRY !

The trigonometric functions of angles are the ratios of the various sides of a triangle. Consider a right-angled triangle ABC as shown in the figure below.

The following terminology is useful.

Hypotenuse: The side opposite to the right angle in a triangle is called the hypotenuse. Here the side AB is the hypotenuse.

 

Opposite Side: The side opposite to the angle in consideration is called the opposite side. So, if we are considering angle A, then the opposite side is BC.

 

Base or Adjacent: The third side of the triangle, which is one of the arms of the angle under consideration, is called the base. If A is the angle under consideration, then the side AC is the base.

For angle A, the following fundamental trigonometric functions can be defined.

Sin A = Opposite side / Hypotenuse (alias: demi; depan/miring)

Cos A = Base / Hypotenuse (alias sami; samping/miring)

Tan A = Opposite side / Base (alias desa; depan/samping)

From the definitions, it can be seen that Tan A = Sin A / Cos A.