Grade 8 Mathematics Module 2, Topic D, Overview

Boy in Classroom

Optional Topic D begins the learning of Pythagorean Theorem.  Students are shown the “square within a square” proof of the Pythagorean Theorem.  The proof uses concepts learned in previous topics of the module, i.e., the concept of congruence and concepts related to degrees of angles.  Students begin the work of finding the length of a leg or hypotenuse of a right triangle using a2 + b2 = c2.  Note that this topic will not be assessed until Module 7. 

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Common Core Learning Standards

CCLS State Standard
8.G.6 Explain a proof of the Pythagorean Theorem and its converse.
8.G.7 Apply the Pythagorean Theorem to determine unknown side lengths in right triangles in real-world...

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