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en.wikipedia.org/wiki/Right_angle

In

www.mathsisfun.com/rightangle.html

www.mathopenref.com/angleright.html

www.khanacademy.org/math/basic-geo/basic-geo-angles/basic-geo-interpreting-angles/v/acute-right-and-obtuse-angles

Sal discusses acute, obtuse, and

study.com/academy/lesson/what-is-a-right-angle-definition-formula-quiz.html

In this lesson, you will learn about the properties that identify

www.amathsdictionaryforkids.com/qr/r/rightAngle.html

Quick Reference from A

www.icoachmath.com/math_dictionary/right_angle.html

www.virtualnerd.com/pre-algebra/geometry/points-lines-planes-angles/planes-angles/acute-obtuse-right-straight-angle-definition

www.ixl.com/math/grade-3/angles-greater-than-less-than-or-equal-to-a-right-angle

Fun

www.splashmath.com/math-vocabulary/geometry/right-angle

Definition of

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www.khanacademy.org

Sal discusses acute, obtuse, and

thinkmath.edc.org

Meaning. Informal: an