# What's the difference in finding the distance between two polar coordinates and two rectangular coordinate?

##### 1 Answer

Mar 11, 2015

Hello,

- In a orthonormal basis, the distance between
#A(x,y)# and#A'(x',y')# is

- With polar coordinates,
#A[t, theta]# and#A'[r',theta']# , you have to write the relations :

So,

Develop, and use the formula

Finally, you know that