Simple vector problems (but causing me a headache)

[Wishingwell]

Homework Statement

For the vectors vector A and vector B in the figure below, use a scale drawing to find the magnitude and direction of the following vector operations. (A = 12.4 m, and B = 18.6 m.)
(Measure angles counterclockwise from the +x axis) Visual link below

I was digging a little online and I found another guy with the same problem. He even has the same questions I am stuck on.
http://www.cramster.com/physics-answers-5-631433-cpi0.aspx

The only thing different are the numbers I have which are stated above. Someone replied with the answer but I have no idea how he got them.

Homework Equations

The only ones I have been given are A+ B = The square root of a^2 + b^2
I also have that Tan(theta) = (ay/ax)

The Attempt at a Solution

I got a correct (both the magnitude and angle). However on b I cannot get the angle correct. C and D I am on now. If any help could be provided that would be great. Moreso is how you set up the equations =) I care more on that than the actual answer.

 

[Jebus_Chris]

Just draw the vectors accurately, length and angles, then measure the length and angle of the resultant.

 

[tiny-tim]

Hi Wishingwell!

For the vectors vector A and vector B in the figure below, use a scale drawing to find the magnitude and direction of the following vector operations. (A = 12.4 m, and B = 18.6 m.)
…

Homework Equations

The only ones I have been given are A+ B = The square root of a^2 + b^2
I also have that Tan(theta) = (ay/ax)
…
Moreso is how you set up the equations =)

Nooo … the question asks you to "use a scale drawing", not equations.

Draw a different https://www.physicsforums.com/library.php?do=view_item&itemid=99" for each part of the question, and just measure the third side.