The mystery angle x is 180 degrees. So theta + 90 degrees-theta + x = 180 degrees. Adding theta and negative theta gives us zero on the left, and subtracting 90 degrees from both sides leaves x equal to 90 degrees. So we have established that the mystery angle x = 90 degrees. {“smallUrl”:“https://www. wikihow. com/images/thumb/e/e8/Do-Garfield%27s-Proof-of-the-Pythagorean-Theorem-Step-4Bullet1. jpg/v4-460px-Do-Garfield%27s-Proof-of-the-Pythagorean-Theorem-Step-4Bullet1. jpg”,“bigUrl”:"/images/thumb/e/e8/Do-Garfield%27s-Proof-of-the-Pythagorean-Theorem-Step-4Bullet1. jpg/aid2777359-v4-728px-Do-Garfield%27s-Proof-of-the-Pythagorean-Theorem-Step-4Bullet1. jpg",“smallWidth”:460,“smallHeight”:345,“bigWidth”:728,“bigHeight”:546,“licensing”:"<div class="mw-parser-output">

License: <a target="_blank" rel="nofollow noreferrer noopener" class="external text" href="https://creativecommons. org/licenses/by-nc-sa/3. 0/">Creative Commons</a>
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