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Common Core State Standard

4.G.A.2

Classify two-dimensional figures based on the presence or absence of parallel or perpendicular lines, or the presence or absence of angles of a specified size. Recognize right triangles as a category, and identify right triangles.

CCSS: 4.G.A.2, MP6
MathPup is at Scruffy's Lab trying out his new device that can see outlines of shapes through steel.  See if you can figure out what geometrical shape it is.  Need help?  Hit the hint button and see MathPup's X-Ray goggles in action!