Simple trigonometry can be used with right angled triangles to a side given a side and one of the interior angles other than the right angle,

With the sides of the triangle as labelled above, we can use one of the formulae:

Example: If we haveandand want to find

For the triangle above, we haveandand want to findThis means we use

Example: If we haveandand want to find

For the triangle above, we haveandand want to findThis means we use

Example: If we haveandand want to find

For the triangle above, we haveandand want to findThis means we use