Heptagon

Template:Odd polygon stat table In geometry, a heptagon is a polygon wi seven sides an seven angles. In a regular heptagon, in which aw sides an aw angles are equal, the sides meet at an angle o 5π/7 radians, 128.5714286 degrees. Its Schläfli seembol is {7}. The aurie (A) o a regular heptagon o side length a is gien bi

$A=\frac{7}{4}{a}^2\cot \frac{\pi }{7}\simeq 3.633912444a^2.$

The heptagon is an aa occasionally referred tae as the septagon, uisin "sept-" (an elision o septua-, a Laitin-derived numerical prefix, rather nor hepta-, a Greek-derived numerical prefix) thegither wi the Greek suffix "-agon" meanin angle).