The Mathematical Symbol "Right Angle with Arc (⊾)"

The "Right Angle with Arc" Symbol (⊾)

The ⊾ symbol is a mathematical notation commonly used in geometry to denote a right angle. While a simple square corner is often enough to represent a right angle, the arc adds emphasis and clarity, especially in hand-drawn diagrams or in contexts where it's vital to explicitly signify a right angle.

Usage of ⊾

The primary purpose of the ⊾ symbol is to indicate that two lines or line segments are perpendicular to each other, meaning they meet at a 90-degree angle.

Example 1: Basic Geometry

In a right triangle, the angle between the two shorter sides is always a right angle. If this triangle is sketched on paper or a board, the ⊾ symbol might be used to clarify that the angle is indeed 90 degrees.

Example 2: Coordinate Geometry

When two lines are perpendicular on a coordinate plane, their slopes are negative reciprocals of each other. The point of intersection might be emphasized with a ⊾ to highlight the right angle between them.

Significance in Different Fields

The concept of perpendicularity and right angles is foundational in many areas of mathematics and science:

  • Architecture and Engineering: Right angles are essential in construction and design for stability and aesthetics.
  • Physics: Concepts such as normal force or reflection of light rely on the principle of perpendicularity.
  • Computer Graphics: The idea of orthogonality and right angles is vital in various algorithms and rendering techniques.

To conclude, the ⊾ symbol serves as an explicit marker of right angles in mathematical diagrams, ensuring clarity and precision in representation.

Mathematical symbol 'Right Angle with Arc'

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Codes for the ⊾ Symbol

The Symbol
Alt CodeAlt 8894
HTML Code⊾
HTML Entity⊾
CSS Code\22BE
Hex Code⊾

How To Insert the ⊾ Symbol

(Method 1) Copy and paste the symbol.

The easiest way to get the ⊾ symbol is to copy and paste it into your document.

Bear in mind that this is a UTF-8 encoded character. It must be encoded as UTF-8 at all stages (copying, replacing, editing, pasting), otherwise it will render as random characters or the dreaded �.

(Method 2) Use the "Alt Code."

If you have a keyboard with a numeric pad, you can use this method. Simply hold down the Alt key and type 8894. When you lift the Alt key, the symbol appears. ("Num Lock" must be on.)

(Method 3) Use the HTML Decimal Code (for webpages).

HTML TextOutput
<b>My symbol: &#8894;</b>My symbol: ⊾

(Method 4) Use the HTML Entity Code (for webpages).

HTML TextOutput
<b>My symbol: &angrtvb;</b>My symbol: ⊾

(Method 5) Use the CSS Code (for webpages).

CSS and HTML TextOutput
span:after {
content: "\22BE";}
<span>My symbol:</span>
My symbol: ⊾

(Method 6) Use the HTML Hex Code (for webpages and HTML canvas).

HTML TextOutput
<b>My symbol: &#x22BE;</b>My symbol: ⊾
On the assumption that you already have your canvas and the context set up, use the Hex code in the format 0x22BE to place the ⊾ symbol on your canvas. For example:
JavaScript Text
const x = "0x"+"E9"
ctx.fillText(String.fromCodePoint(x), 5, 5);

(Method 7) Use the Unicode (for various, e.g. Microsoft Office, JavaScript, Perl).

The Unicode for ⊾ is U+22BE. The important part is the hexadecimal number after the U+, which is used in various formats. For example, in Microsoft Office applications (e.g. Word, PowerPoint), do the following:
[Hold down Alt]
[Press x]

(The 22BE turns into ⊾. Note that you can omit any leading zeros.)
In JavaScript, the syntax is \uXXXX. So, our example would be \u22BE. (Note that the format is 4 hexadecimal characters.)
JavaScript TextOutput
let str = "\u22BE"
document.write("My symbol: " + str)
My symbol: ⊾