SOLUTION: A triangle is defined by placing vectors [5, 7] and [−21, 15] tail to tail. Find its angles.

Question 1154418: A triangle is defined by placing vectors [5, 7] and [−21, 15] tail to tail. Find its angles.
Answer by ikleyn(52781) (Show Source): You can put this solution on YOUR website!
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(1)  You may assume that one vertex of the triangle is placed at the origin of the coordinate system.


(2)  Assuming this, find coordinates of two other vertices of the triangle.


(3)  Then find the lengths of the three sides of the triangle.


(4)  Then use the cosine law.

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