The area of a pentagon can be calculated using the following formula: if you know the perimeter and the apothem.
If you know the length of the perimeter in a pentagon and the apothem, you can calculate its area using the following formula:
$$p = "perimeter value"$$
$$a = "apothem: distance from the center to the closest point in the figure"$$
It is a geometric figure with 5 sides, all the sides have equal length. Also a regular pentagon has all the same angles. All regular pentagons look the same.
An irregular pentagon can have vitually infinite posibles shapes, Despite this all have 5 sides.
The apothem it´s the distance between the center of the geometric figure and the closest point in the figure to the center.
It is the space of the internal surface in a figure, it is limited for the perimeter. Also, the area can be calculated in a plane of two dimensions.
It is a representation of a rule or a general principle using letters. (Algebra by A. Baldor)
When describing formulas in plural, it is also valid to say "formulae".
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