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# Help!

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Determine the value of ? in the figure below.

Mar 19, 2021

The vertical side that both triangles side is, according to the Pythagorean theorem, $$\sqrt{5^2-1^2} = \sqrt{24}$$. Apply it once again the Pythagorean theorem to find out the missing side: $$\sqrt{25+24} = \boxed{7}$$