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**).