The following formulas were used to develop calculations for this calculator where a = side length, r = inradius (apothem), R = circumradius, A = area, P = perimeter, x = interior angle, y = exterior angle and n = number of sides. When the number of sides, n, is equal to 3 it is anĮquilateral triangle and when n = 4 is is a Name of the Shape: About It: Triangle: A triangle is a three-sided polygon that has three vertices and three edges. All sides are equal length placed around a common center so that all angles between sides are also equal. Any other base unit can be substituted.Ī regular polygon is a polygon that is both equiangular and equilateral. The units are in place to give an indication of the order of the calculated results such as ft, ft 2 or ft 3. Angle: 135° Interior angles add up to 1080° Irregular Octagon. Units: Note that units of length are shown for convenience. Angle: 128.6° (to 1dp) Interior angles add up to 900° Irregular Heptagon. A hexagon is a 6-sided polygon, an octagon is an 8-sided polygon and a decagon is a 10-sided polygon. Calculate from an regular 3-gon up to a regular 1000-gon. A heptagon is a type of polygon with seven sides and angles that are all equal. Calculates side length, inradius (apothem), circumradius, area and perimeter. Enter any 1 variable plus the number of sides or the polygon name. It has 12 faces, and all are like pentagons. Hepta - is a Greek prefix meaning seven and - agon comes from the Greek word for angle. A dodecagon is also called a regular polyhedron whose all faces are of the same shape. A seven-sided shape is called a heptagon. The word heptagon comes from two words: ‘hepta’, meaning seven and ‘gon’ meaning sides. ![]() ![]() A regular polyhedron is a 3D shape having all faces of the same shape. A heptagon is a seven-sided polygon.It is also known as a septagon. Use this calculator to calculate properties of a regular polygon. A polyhedron is a solid and 3D shape that contains flat surfaces and straight edges.
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