Solving aspect ratio problems with the Pythagorean theorem | Khan Academy

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https://www.khanacademy.org/math/8th-grade-illustrative-math/unit-8-pythagorean-theorem-and-irrational-numbers/x227a3420c609ee43:lesson-18-when-is-the-same-size-not-the-same-size/v/solving-aspect-ratio-problems-with-the-pythagorean-theorem

Solve an aspect-ratio problem end to end with the Pythagorean theorem, setting up an equation from a given ratio and diagonal length. Solve for the unknown, find the actual side lengths, and finish by calculating the area.

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https://www.youtube.com/watch?v=R32NVZowWMY
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