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The 28 pages that link to Right triangle, each with the reason it gives.

• TriangleBroader topic: The right angle enables the Pythagorean theorem and familiar trigonometric ratios.

• CircumcircleBroader topic: Its circumcenter is the midpoint of its hypotenuse.

• TrigonometryBroader topic: Its side ratios define the basic trigonometric functions.

• CircumcenterBroader topic: Its circumcenter is the midpoint of the hypotenuse.

• Thales' theoremBroader topic: The diameter and any point on the semicircle form a right triangle.

• Euler lineBroader topic: Its orthocenter is the right-angle vertex, making the Euler line easy to locate.

• Right angleBroader topic: The right angle defines this triangle’s distinctive shape and its trigonometric relations.

• Euler's inequalityBroader topic: Its circumradius is half its hypotenuse, offering a direct test of the bound.

• Feuerbach's theoremBroader topic: Its orthocenter is a vertex, simplifying the nine-point-circle construction.

• Conway circle theoremBroader topic: Its side lengths provide a simple setting for calculating the incircle and excircles explicitly.

• Droz-Farny line theoremBroader topic: Its orthocenter is the right-angle vertex, a useful degenerate-looking special case.

• Equal Incircles TheoremBroader topic: Its inradius has a direct expression in terms of its side lengths.

• Law of cotangentsBroader topic: Its right angle has cotangent zero, simplifying the identity to a product of the other two cotangents equal to one.

• Lester's theoremBroader topic: Its circumcenter lies at the hypotenuse midpoint, giving a simple special case to examine.