Use Cosine To Calculate The Side Of A Right Triangle

Example:

Calculate the value of cosθ in the triangle.

Solution:
Use the Pythagorean theorem to evaluate the length of PR.

How To Use Tangent To Calculate The Side Of A Triangle?

Example:

Calculate the length of the side x, given that tan θ = 0.4

Solution:

How To Use Sine To Calculate The Side Of A Triangle?

Example:

Calculate the length of the side x, given that sin θ = 0.6

Solution:

Using the Pythagorean theorem: