Finding the area of a tilted square | 8th grade math (IM® v.360 aligned) | Khan Academy

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https://www.khanacademy.org/math/8th-grade-illustrative-math/unit-8-pythagorean-theorem-and-irrational-numbers/x227a3420c609ee43:lesson-1-the-areas-of-squares/v/finding-the-area-of-a-tilted-square

Find the area of a tilted square drawn on a grid, where its sides don't run along the gridlines. Practice using the grid to reason about area when the usual side-length approach doesn't directly apply.

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https://www.youtube.com/watch?v=P_Y5W7BXCH4
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