geometry, the semiperimeter of a polygon is half its perimeter. Although it has such a simple derivation from the perimeter, the semiperimeter appears frequently...

⁠ ⁠ c . {\displaystyle c.} ⁠ Letting ⁠ s {\displaystyle s} ⁠ be the semiperimeter of the triangle, s = 1 2 ( a + b + c ) , {\displaystyle s={\tfrac {1}{2}}(a+b+c)...

{\displaystyle \triangle ABC} with sides a ≤ b < c {\displaystyle a\leq b<c} , semiperimeter s = 1 2 ( a + b + c ) {\textstyle s={\tfrac {1}{2}}(a+b+c)} , area T...

sides a {\displaystyle a} , b {\displaystyle b} , c {\displaystyle c} , semiperimeter s {\displaystyle s} , area T {\displaystyle T} , exradii r a {\displaystyle...

− d ) {\displaystyle K={\sqrt {(s-a)(s-b)(s-c)(s-d)}}} where s, the semiperimeter, is defined to be s = a + b + c + d 2 . {\displaystyle s={\frac {a+b+c+d}{2}}...

= 1 2 ( a + b + c ) {\displaystyle s={\tfrac {1}{2}}(a+b+c)} is the semiperimeter. The tangency points of the incircle divide the sides into segments...

( a + b + c + d ) {\displaystyle s={\tfrac {1}{2}}(a+b+c+d)} is the semiperimeter of the trapezoid. (This formula is similar to Brahmagupta's formula...

perimeter into two equal lengths, this common length being called the semiperimeter of the triangle. The three splitters of a triangle all intersect each...

= 1 2 ( a + b + c ) {\displaystyle s={\tfrac {1}{2}}(a+b+c)} be the semiperimeter, T = s ( s − a ) ( s − b ) ( s − c ) . {\displaystyle T={\sqrt {s(s-a)(s-b)(s-c)}}...

(orig. 1960). Gutierrez, Antonio, "Hexagon, Inscribed Circle, Tangent, Semiperimeter", [1] Archived 2012-05-11 at the Wayback Machine, Accessed 2012-04-17...

The parameters in a triangle inequality can be the side lengths, the semiperimeter, the angle measures, the values of trigonometric functions of those...

q: K = p ⋅ q 2 , {\displaystyle K={\frac {p\cdot q}{2}},} or as the semiperimeter times the radius of the circle inscribed in the rhombus (inradius):...

inequality holding for an obtuse triangle. For an acute triangle with semiperimeter s,: p.115, #2874  s − r > 2 R , {\displaystyle s-r>2R,} and the reverse...

+ c {\displaystyle d={\frac {2{\sqrt {bcs(s-a)}}}{b+c}}} where the semiperimeter s = a + b + c 2 . {\displaystyle s={\tfrac {a+b+c}{2}}.} The side of...

+ c ) {\textstyle 2{\sqrt {bcs(s-a)}}{\big /}(b+c)} where s is the semiperimeter (and likewise for the other angles' bisectors). Any altitude dropped...

, R ( z ) {\displaystyle R(z),R(z)} and l 1 {\displaystyle l_{1}} (semiperimeter R ( z ) + l 1 ( z ) / 2 {\displaystyle R(z)+l_{1}(z)/2} ) plus n {\displaystyle...

where the sides in sequence are a, b, c, d, where s is the semiperimeter, and A and C are two (in fact, any two) opposite angles. This reduces...

semi-diameters of a superellipse, superellipsoid, or superquadric can be identified in the same way. Flattening Semi-major and semi-minor axes Semiperimeter...

d ) {\displaystyle K={\sqrt {(s-a)(s-b)(s-c)(s-d)}}\,} where s, the semiperimeter, is s = ⁠1/2⁠(a + b + c + d). This is a corollary of Bretschneider's...

coordinate system Pole Real axis Secant line CIrcular sector or "sector" Semiperimeter Symmetry Shape Pattern Crystal system Frieze group Isometry Lattice...

In the earliest usages, the Greek letter π was used to denote the semiperimeter (semiperipheria in Latin) of a circle and was combined in ratios with...

s = 1 2 ( a + b + c ) {\textstyle s={\tfrac {1}{2}}(a+b+c)} is the semiperimeter, or half of the triangle's perimeter. Three other equivalent ways of...

Nagel point intersection of lines from each vertex to the corresponding semiperimeter point X(9) Mittenpunkt symmedian point of the triangle formed by the...

b,c)<a+b+c} and thus that the longest side length is less than the semiperimeter. A mathematically equivalent formulation is that the area of a triangle...

the given triangle. The perimeter of the medial triangle equals the semiperimeter (half the perimeter) of the original triangle, and its area is one quarter...

{A-B}{2}}}{\tan {\frac {A+B}{2}}}}={\frac {a-b}{a+b}}} . If s is the triangle's semiperimeter, (a + b + c)/2, and r is the radius of the triangle's incircle, then...

radius of the outer Soddy circle of any right triangle is equal to its semiperimeter. The outer Soddy center is located at D, where ACBD is a rectangle,...

side lengths of a triangle are a , b , c {\displaystyle a,b,c} , the semiperimeter s = ( a + b + c ) / 2 , {\displaystyle s=(a+b+c)/2,} and A is the angle...

line segment from the orthocenter to the circumcenter as e, and the semiperimeter as s, the following inequalities hold: d s < d u < d v < 1 3 ; {\displaystyle...

\textstyle k={\sqrt {s(s-a)(s-b)(s-c)}}} , where s {\displaystyle s} is the semiperimeter – was known to Archimedes several centuries before Heron lived. Arabic...