document.write( "Question 1154418: A triangle is defined by placing vectors [5, 7] and [−21, 15] tail to tail. Find its angles. \n" ); document.write( "

Algebra.Com's Answer #776843 by ikleyn(52787) $\"\"$ $\"About$

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document.write( "(1)  You may assume that one vertex of the triangle is placed at the origin of the coordinate system.\r\n" );
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document.write( "(2)  Assuming this, find coordinates of two other vertices of the triangle.\r\n" );
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document.write( "(3)  Then find the lengths of the three sides of the triangle.\r\n" );
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document.write( "(4)  Then use the cosine law.\r\n" );
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