Yes, I got the same answers as yours ticbol. The sum of the answers returns pi.
Are you sure you're using Law of Cosines correctly, Enigma?
Label the vertices of one triangle A, B, C. The side opposite the vertex will be labeled as the lowercase letter of the vertex. For instance, if you're to find angle A, use the following:
a^2 = b^2 + c^2 - 2bc cos(A)
Image:Triangle with notations.svg - Wikimedia Commons