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right triangle

Triangle in which one angle is a 90-degree angle

EntityQ158688

Also known as right-angled triangle

Subclass of: non-equilateral triangle

Overview

From Wikipedia, the free encyclopedia · Read full article · Text CC BY-SA 4.0

A right triangle or right-angled triangle, sometimes called an orthogonal triangle or rectangular triangle, is a triangle in which two sides are perpendicular, forming a right angle.

Overview

All data

22 statements · 18% with external sources · numbers in brackets are citations

Has facet polytope: hypotenuse quantity: 1
cathetus quantity: 2
Has characteristic: semiperimeter defining formula: 2R+r
inradius defining formula: r = \frac{a+b-c}{2} = \frac{ab}{a+b+c}
area defining formula: T = 1/2 b h
Pythagorean theorem
Opposite of: acute or obtuse triangle
Members / parts: right angle quantity: 1

On other databases

14 identifiers linking right triangle across the web's reference databases

Data quality

statements

18%

externally sourced

Source last edited August 17, 2026. AIDB refreshes this page daily.

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AIDB. (2026). right triangle (Q158688). Retrieved from https://aidb.si/e/right-triangle-Q158688