# What is Sine, Cosine and Tangent?

##### 1 Answer

Sine, Cosine and Tangent are the names of three of the comparisons between the lengths of the sides of a right-angled triangle.

#### Explanation:

Trigonometry deals with the sides and angles in triangles and the relationship between them. In a right-angled triangle, the sides are named according to the each of the acute angles,

The longest side in the triangle is called the hypotenuse - it is opposite the angle of

In trigonometry the lengths of the 3 sides are compared in the form of ratios. Think of them as fractions.

If the sides are of length

When the ratio involves the sides:

When the ratio involves the sides:

When the ratio involves the sides:

The ratios are always found with reference to an angle and they represent a value.

This means that if a triangle has an angle of

This means that for an angle of

This means that for an angle of