Linked from

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

• Equilateral triangleRelated: Equal side lengths make its perimeter three times one side length.

• PolygonRelated: Adding the lengths of a polygon’s sides gives its perimeter.

• Heron's formulaRelated: The semiperimeter in Heron's formula is half the triangle's perimeter.

• Line segmentRelated: For a polygon, the perimeter is the sum of its side-segment lengths.

• RectangleRelated: A rectangle’s perimeter is twice the sum of its side lengths.

• SquareRelated: A square’s perimeter is four times its side length.

• Geometric inequalityRelated: Perimeter constraints lead to classical bounds on the area a shape can enclose.

• Blaschke–Lebesgue theoremRelated: Barbier’s theorem fixes perimeter for all constant-width bodies of the same width.

• DecagonRelated: A decagon’s perimeter is the sum of its ten side lengths.