# Using cosine ratio to calculate angles and side (Cos = $\frac{a}{h}$)

### Using cosine ratio to calculate angles and side (Cos = $\frac{a}{h}$)

Cosine ratios are exactly the same idea of sine ratios or tangent ratios. The only difference between it and the other two trigonometric ratios is that it is the ratio of the adjacent side to the hypotenuse of a right triangle.