CCSS.MATH.CONTENT.8.G.B.6Explain a proof of the Pythagorean Theorem and its converse.
CCSS.MATH.CONTENT.8.G.B.7Apply the Pythagorean Theorem to determine unknown side lengths in right triangles in real-world and mathematical problems in two and three dimensions.
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https://schoolyourself.org/page/lti/sy/geometry/pythagorean-theorem