Question 1188226
Please help me solve this equation Find the angles of the triangle having the following vertices 
A(3,7), B(-6,4) and C(-2,8). Thank you so much. 
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Find the 3 side lengths.
For AB (side c):
{{{c = sqrt(diffy^2 + diffx^2) = sqrt(3^2 + 9^2) = 3sqrt(10)}}}
Find the other 2 sides the same way, then use the Cosine Law to find angles.