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triangle ABC is a right angle. If AC=12 and BC=13 find AB
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https://www.khanacademy.org/math/trigonometry/basic-trigonometry/basic_trig_ratios/v/example--trig-to-solve-the-sides-and-angles-of-a-right-triangle go to this site, maybe you will understand..
use Pythagorean Theorem
ok
13^2=12^2+b^2
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