Question

What is the distance between the following polar coordinates?: `(7,(5pi)/4), (1,(15pi)/8)`

Answer 1

`d~~7.44`

Explanation:

`d=sqrt(r_1 ^2 -2r_1r_2cos(theta_1 -theta_2)+r_2 ^2`
`d=sqrt(7^2-2(7)(1)cos((5pi)/4 -(15pi)/8)+1^2`
`d~~7.44`