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HippoCampus Algebra & Geometry 8 Online
OpenStudy (anonymous):

How do you know if a triangle is right?

OpenStudy (anonymous):

A triangle is a right triangle if one of its angles is exactly 90 degrees. An angle is 90 degrees (or right) if the two segments forming the angle are perpendicular to one another. Lines are perpendicular if they form a capital L.

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