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on page 1 9 t1 letamp;#39;s take a look at example number three so in this one they say find the length to the nearest tenth of a centimeter in the of the third side of triangle pqr if qp so q2p is 1.7 centimeters qr is 3.1 centimeters and angle q pqr so that would be this angle here so if you ever in doubt draw over your the way they say it and you should be able to see your triangle or the angle so thatamp;#39;s that angle so thatamp;#39;s 110 degrees so in this type of question if this was a question without me knowing this is a cosine law question i would go through my checklist um number one can i use sohcahtoa no because itamp;#39;s not a right angle triangle can i use my sign law no because i donamp;#39;t have one complete pair of an angle and itamp;#39;s opposite side so thatamp;#39;s out so it has to be cosine law if anything works so for cosine law to find a missing side i need to have two enclosed sides with an angle in between yes it does so iamp;#39;m going to use
