Equipotential Surfaces and Electric Field

[ihearyourecho]

Homework Statement

A given system has the equipotential surfaces shown in the figure .
http://session.masteringphysics.com/problemAsset/1122530/1/Walker.20.39.jpg

A)What is the magnitude of the electric field?
B)What is the direction of the electric field? (in degrees from the +x axis)
C)What is the shortest distance one can move to undergo a change in potential of 1.50 V?

Homework Equations

E=-V/R

The Attempt at a Solution

I found the answer to the Part A:
E= -V/R, R=4sin(26.565)
E=559 V/M

I cannot wrap my head around the answer to Part B, though. I thought it would simply be 180-25.65, but that's wrong. Any help?

I also know how to do Part C, so just Part B would be great!

 

[ihearyourecho]

Answers that are also not correct are:
153
63.4
117.

 

[ihearyourecho]

Nevermind, I was doing the angle perpendicular in the wrong direction. I got the answer.