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In triangle abc, the length of side ab is 12 cm, the length of side bc is 5 cm, and the length of side ca is 9 cm. find the measure of angle a using the law of cosines.
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What is the perimeter of a rectangular building that is 80 feet wide and 140 feet deep?
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Because the slopes of FE and OB are the same (), FE||OB....
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