en.wikipedia.org/wiki/Right_angle

A right angle is equal to 90 degrees. A line segment (AB) drawn so that it forms
right angles with a line (CD). In geometry and trigonometry, a right angle is an
angle that bisects the angle formed ...

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°. angle 90
degrees. This is a right angle. Note the special symbol like a box in the angle.

www.mathsisfun.com/geometry/degrees.html

We can measure Angles in Degrees. There are 360 degrees in one Full Rotation
(one complete circle around). (Angles can ... circle is 90° (called a Right Angle) ...

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

Knowing how to identify these angles is an important part of solving many ... right
angle; right angles; straight; straight angle; straight angles; degree; degrees ...

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.mathopenref.com/angleright.html

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

mathcentral.uregina.ca/QQ/database/QQ.09.06/becky1.html

We know that all the angles add up to 180 degrees but cant find a valid reason
for it. Hi Becky,. Suppose that you had a right angle triangle. Note that if you take
...

www.math.com/school/subject3/lessons/S3U3L4DP.html

A right triangle has one angle equal to 90 degrees. A right triangle can also be an
isosceles triangle--which means that it has two sides that are equal. A right ...

en.wikibooks.org/wiki/Trigonometry/Angles_of_a_triangle_sum_to_180_Degrees

is a right angle, it means that the sum of the angles of any triangle is the same as
two right angles. If we 'tore the corners off' and placed them together at the ...