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

A

en.wikipedia.org/wiki/Right_angle

A **right angle** is equal to 90 **degrees**. ... In Hilbert's axiomatization of geometry this
statement is given as a theorem, but only after **much** groundwork. One may ...

www.mathsisfun.com/angles.html

An angle measures the amount of turn. Names of Angles. As the Angle Increases,
the Name Changes: types of angle ...

www.mathsisfun.com/geometry/degrees.html

We can measure Angles in

www.algebra.com/algebra/homework/Angles/Angles.faq.question.209349.html

Algebra ->

www.khanacademy.org/math/basic-geo/basic-geo-angles/basic-geo-interpreting-angles/v/measuring-angles-in-degrees

It shows up

www.answers.com/Q/How_many_degrees_in_a_right_angle

Answer There is 90'

www.answers.com/Q/How_many_degrees_does_a_right_angle_triangle_add_up_to

All triangles have a total of 180

www.dummies.com/how-to/content/measuring-and-making-angles.html

The most common measure of an angle is in

en.wikibooks.org/wiki/Trigonometry/Angles_of_a_triangle_sum_to_180_Degrees

The Sum of Angles[edit]. In any triangle the angles always sum to 180^{\circ}\,.
This is a perhaps surprising fact. Because 90^{\circ}\, is a

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