# math

posted by
**fishycakes**
.

Rectangle A

Find the length of the diagonal of the rectangle A

Cordinates (-1,-5) (-1,-2) (5,-2) (5,-5)

i got the equation d= √(-1-5)^2+(-2--5)^2

and came up wtih the answer of 15, but the answer key is 3√5

The calculator is never wrong SO IM WRONG help please :( i'm desperate because i'm pretty sure i've done this right!!! Thank you! :)