Question

What is the distance between `(1 ,( pi)/4 )` and `(4 , ( pi )/2 )`?

Answer 1

`sqrt(17-4sqrt2)approx 3.368`

Explanation:

After using cosine theorem,

`sqrt(1^2+4^2-2*1*4*cos(pi/2-pi/4))`

=`sqrt(17-4sqrt2)`

`approx 3.368`