# What is the distance between #(3 ,( pi)/4 )# and #(4 , ( pi )/2 )#?

##### 1 Answer

Jan 17, 2017

Use a variant of The Law of Cosines

#### Explanation:

The distance is one side of a triangle with the other two sides being the two given radii, 3 and 4, and the angle between them the difference of the two angles. This allows us to use the The Law of Cosines :

where