Octagon eight lines of reflective symmetry and rotational symmetry of order 8. A regular octagon is represented by the Schläfli symbol {8}. The internal angle at each vertex of a regular octagon is 135° (formula_1 radians). The central angle is 45° (formula_2 radians). The area of a regular octagon of side length "a" is given by In terms of the circumradius "R", the area is In terms of the apothem "r" (see also inscribed figure), the area is These last two coefficients bracket the value of pi, the area of the unit circle. The area can also be expressed as where
The Octagon House relation to the other street, and outbuildings and wells had to be fitted in also. He dealt with the problem by relating the house equally to both streets, which put the two walls at a 70 degree angle from each other. The house actually has 6 sides, but was called "The Octagon" by the Tayloes. It had closets on every floor, an innovative feature for its time. The house is well built of brick trimmed with Aquia Creek sandstone. The lot is triangular and fenced in by a high brick wall. The kitchen, stable and outhouses are built of brick