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en.wikipedia.org/wiki/Right_angle

A rectangle is a quadrilateral with four right angles. A square has four right angles, in addition to equal-length sides.

www.mathsisfun.com/rightangle.html

Note the special symbol like a box in the angle. If we see this, it is a right angle. The 90° is rarely written in. If we see the box in the corner, we are being told it is ...

www.mathsisfun.com/definitions/right-angle.html

Math explained in easy language, plus puzzles, games, quizzes, worksheets and ... Right Angle ... An angle which is equal to 90°, one quarter of a full revolution.

www.mathopenref.com/angleright.html

Definition of an right angle (one whose measure is exactly 90 degrees).

An obtuse angle is greater than a right angle which is 90 degrees. An acute angle is less than 90 degrees. :) 2 Votes. • Comment on Missy Poe's question • Flag ...

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

Definition of Right Angle explained with illustrated examples. Also, practice lots of math problems with fun math worksheets at Splash Math.