The area of a regular heptagon is equal to the perimeter multiplied by the apothem, divided by two, or P x A/2. The perimeter can be calculated by adding up the length of all the sides, while the apothem is the distance from the center of the heptagon to the middle of any side.
A heptagon refers to any 7-sided polygon. A regular polygon has seven sides of the same length that all have the same interior angle. The area can be calculated with a formula for a regular heptagon, but to calculate the area for an irregular heptagon, the shape must be broken apart into smaller polygons before summing the individual areas.