If f = 40 cm and g = 41 cm, what is the length of e?

I am so comused  on what to do 

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The correct answer is 40! You can use Pythagorean theorem. That is a2+b2=c2. 92+b2=41² 81+b2=1681. Subtract 81 from both sides then do the square root of both sides to = 40. Hope this helps! :D

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