Linked from

The 15 pages that link to Triangle area, each with the reason it gives.

• TriangleBroader topic: The simplest area formula expresses how a triangle’s base and altitude determine its size.

• Equilateral triangleRelated: For side length a, its area is √3a²/4.

• Heron's formulaNarrower topic: Heron's formula is a way to calculate this area without knowing a height.

• Right triangleRelated: The two perpendicular legs provide a direct base-and-height pair.

• IncircleRelated: The incircle gives the alternative area formula: inradius multiplied by semiperimeter.

• SemiperimeterNarrower topic: Semiperimeter-based formulas provide ways to compute area from side lengths alone.

• Euler's inequalityRelated: Writing the area as both rs and abc/(4R) links the radii.

• Vector geometryRelated: Half the magnitude of the cross product of two side vectors gives the area.

• Bretschneider's formulaNarrower topic: Triangle area identities provide a route to deriving the four-sided formula.

• Viviani's theoremRelated: Joining the interior point to the vertices partitions the triangle into three smaller triangles whose areas add.

• Stewart's theoremRelated: A known area and base can determine a triangle’s altitude, which may serve as a cevian.

• Weitzenböck's inequalityNarrower topic: The area is the geometric quantity bounded by the sum of squared sides.

• Hadwiger–Finsler inequalityRelated: Area is the quantity controlled by the sum of squared side lengths.

• Pedoe's inequalityNarrower topic: Pedoe's inequality compares each triangle's area with its squared side lengths.

• Equal Incircles TheoremRelated: Equal radii can be tested by comparing area-to-semiperimeter ratios.