## The Mathematical Symbol "Right Angle (∟)"

The "Right Angle" Symbol (∟)

The ∟ symbol represents a "right angle" in geometrical contexts. In Euclidean geometry, a right angle is an angle of exactly 90°, corresponding to a quarter of the full circle.

## Usage of ∟

Right angles are a fundamental concept in geometry and trigonometry. Their properties have been understood and utilized since ancient times.

Example 1: In Rectangles

All four angles in a rectangle are right angles. Thus, if a quadrilateral has four right angles (as denoted by ∟), then it is a rectangle.

Example 2: Pythagoras' Theorem

In a right-angled triangle, the side opposite the right angle is called the hypotenuse. Pythagoras' theorem states that in a right-angled triangle, the square of the length of the hypotenuse is equal to the sum of the squares of the other two sides. If ∟ denotes the right angle, then the theorem can be represented as: c² = a² + b², where c is the length of the hypotenuse, and a and b are the lengths of the triangle's other two sides.

## Significance in Different Fields

Right angles have a wide range of applications:

**Architecture:**Right angles are crucial in construction, ensuring structures are perpendicular and stable.**Mathematics:**They're foundational in geometry, trigonometry, and calculus.**Astronomy:**Right angle triangles aid in calculations involving the distances and sizes of celestial bodies.

In summary, the ∟ symbol is a simple yet powerful representation of a concept that has been essential in various disciplines throughout history.

## Are You Good at Mathematical Symbols?

Do you know, or can you guess, the technical symbols? Well, let's see!**Gold**

**Silver**

**Bronze**

- This test has questions.
- A correct answer is worth 5 points.
- You can get up to 5 bonus points for a speedy answer.
- Some questions demand more than one answer. You must get every part right.
**Beware!**Wrong answers score 0 points.- 🏆 If you beat one of the top 3 scores, you will be invited to apply for the Hall of Fame.

**Scoring System**

Guru (+)

Hero (+)

Captain (+)

Sergeant (+)

Recruit (+)

## Codes for the ∟ Symbol

The Symbol | ∟ | |

Alt Code | Alt 8735 | |

HTML Code | ∟ | |

HTML Entity | ∟ | |

CSS Code | \221F | |

Hex Code | ∟ | |

Unicode | U+221F |

## 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 8735. When you lift the Alt key, the symbol appears. ("Num Lock" must be on.)(Method 3) Use the HTML Decimal Code (for webpages).

HTML Text | Output |
---|---|

<b>My symbol: ∟</b> | My symbol: ∟ |

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

HTML Text | Output |
---|---|

<b>My symbol: ∟</b> | My symbol: ∟ |

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

CSS and HTML Text | Output |
---|---|

<style> span:after { content: "\221F";} </style> <span>My symbol:</span> | My symbol: ∟ |

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

HTML Text | Output |
---|---|

<b>My symbol: ∟</b> | My symbol: ∟ |

**0x221F**to place the ∟ symbol on your canvas. For example:

JavaScript Text |
---|

const x = "0x"+"E9" ctx.fillText(String.fromCodePoint(x), 5, 5); |

Output |

∟ |

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

The Unicode for ∟ is**U+221F**. 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:

Type | Output |
---|---|

221F [Hold down Alt] [Press x] | ∟ (The 221F turns into ∟. Note that you can omit any leading zeros.) |

JavaScript Text | Output |
---|---|

let str = "\u221F" document.write("My symbol: " + str) | My symbol: ∟ |

## You might also like...

#### Help Us Improve Mathematics Monster

- Do you disagree with something on this page?
- Did you spot a typo?

__this form__.

#### Find Us Quicker!

- When using a search engine (e.g., Google, Bing), you will find Mathematics Monster quicker if you add
**#mm**to your search term.

#### Share This Page

If you like Mathematics Monster (or this page in particular), please link to it or share it with others.

If you do, __please tell us__. It helps us a lot!

#### Create a QR Code

Use our handy widget to create a QR code for this page...or any page.

next up:

## More about Mathematical Symbols

Mathematics is a universal language that is used to describe and understand the intricacies of the universe. At the heart of this language are symbols, concise representations that convey specific meanings and ideas.Just as letters come together to form words in spoken languages, mathematical symbols combine to form expressions and equations, encapsulating intricate ideas in a compact form. The history of these symbols is as varied as their meanings; some have been in use for centuries while others have been introduced more recently to describe new discoveries and concepts. Whether you are a student, educator, researcher, or simply curious, this list of mathematical symbols will serve as a guide, shedding light on their meanings, origins, and applications.

From the simple plus and minus signs to the more esoteric and complex, each symbol has its unique story and significance.