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  1. Etymology

    The meaning of right in right angle possibly refers to the Latin adjective rectus 'erect, straight, upright, perpendicular'. A See more

    Right angle - Wikipedia

    • In geometry and trigonometry, a right angle is an angle of exactly 90 degrees or ⁠/2⁠ radians corresponding to a quarter turn. If a ray is placed so that its endpoint is on a line and the adjacent angles are equal, then they are right angles. The term is a calque of Latin angulus rectus; here rectus means "upright", referring to the vertical perpendicular to a horizontal base line. Closely … See more

    In elementary geometry

    A rectangle is a quadrilateral with four right angles. A square has four right angles, in addition to equal-length sides.
    The Pythagorean theorem states how to determine when a triangle is a right triangle. See more

    Symbols

    In Unicode, the symbol for a right angle is U+221F ∟ RIGHT ANGLE (∟). It should not be confused with the similarly shaped symbol U+231E ⌞ BOTTOM LEFT CORNER (⌞, ⌞). Related symbols ar… See more

    Euclid

    Right angles are fundamental in Euclid's Elements. They are defined in Book 1, definition 10, which also defines perpendicular lines. Definition 10 does not use numerical degree measurements but rather touc… See more

    Conversion to other units

    A right angle may be expressed in different units:
    • ⁠1/4⁠ turn
    • 90° (degrees)
    • ⁠π/2⁠ radians
    • 100 grad (also called grade, gradian, or gon)… See more

    Rule of 3-4-5

    Throughout history, carpenters and masons have known a quick way to confirm if an angle is a true right angle. It is based on the Pythagorean triple (3, 4, 5) and the rule of 3-4-5. From the angle in question, running a straight lin… See more

    Thales' theorem

    Thales' theorem states that an angle inscribed in a semicircle (with a vertex on the semicircle and its defining rays going through the endpoints of the semicircle) is a right angle.
    Two applic… See more

     
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  2. 90 degrees
    • According to 2 sources
    In geometry and trigonometry, a right angle is an angle of exactly 90 degrees or ⁠ 2 ⁠ radians [1] corresponding to a quarter turn. [2] If a ray is placed so that its endpoint is on a line and the adjacent angles are equal, then they are right angles. [3]
    A right angle is an angle with a measurement of 90 degrees. When two lines cross each other so that all the angles have the same size, the result is four right angles. The top of the letter T is at right angles to the vertical line. Walls of buildings are usually at right angles to the floor.
     
  3. Right angle - Simple English Wikipedia, the free encyclopedia

     
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  11. Degree (angle) - Wikipedia

    One degree (shown in red) and eighty nine degrees (shown in blue). The lined area is a right angle.

  12. Right Angle - Definition, Shape, Examples and …

    What is a Right Angle? If the measure of the angle between two rays is exactly equal to 90 degrees or π/2, then the angle is called a right angle. Angles that measure less than 90° such as 87°, 56°, 77°, 42°, etc., are acute angles and …

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  13. Right Angles - Math is Fun

    See the angle types yourself: A right angle is an internal angle equal to 90 ... This is a right angle ... See that special symbol like a box in the corner? That says it is a right angle.

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  14. right angle - Wiktionary, the free dictionary

  15. What is a Right Angle? | 90° Angle | Definition, Examples - Twinkl

  16. Right Angles | Definition and Examples | Twinkl Wiki

  17. Trigonometry - Wikipedia

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  19. Right Angle – Definition, Examples, Facts - Brighterly

  20. Special right triangle - Wikipedia

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  22. Sine and cosine - Wikipedia