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en.wikipedia.org/wiki/Right_angle

In geometry and trigonometry, a right angle is an angle of exactly 90° (degrees), corresponding to a quarter turn. If a ray is placed so that its endpoint is on a line ...

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

Acute angles measure less than 90 degrees. Right angles measure 90 degrees. Obtuse angles measure more than 90 degrees. Learn about angles types and ...

www.mathsisfun.com/angles.html

Angles. An angle measures the amount of turn ... Acute Angle, is less than 90°. Right Angle, is 90° exactly ... Example: −67°. negative 67 degrees. angle ...

www.reference.com/math/many-degrees-right-angle-c504884e507c6012

A right angle has 90 degrees. Angles are measured on a scale from 0 to 360 degrees. Right angles represent one-fourth of a full 360-degree...

www.mathsisfun.com/rightangle.html

Right Angles. A right angle is an internal angle which is equal to 90°. right angle: 90 degrees. This is a right angle. Note the special symbol like a box in the ...

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

When a triangle has a right angle, it becomes a special type of triangle called a right triangle. Right triangles always have exactly one angle that is 90 degrees.

www.coolmath.com/reference/triangles-types

Definitions and formulas for triangles including right triangles, equilateral ... The right triangle has one 90 degree angle and two acute (< 90 degree) angles.

www.dummies.com/education/math/geometry/measuring-and-making-angles

The most common measure of an angle is in degrees. Here is a brief ... The right angle is one of the most easily recognizable angles. It's in the form of the letter L ...

www.mathopenref.com/angleright.html

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