to find the perimeter you must add all sides.
and to find area you have to multiply lenght and width
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Although some have said Archimedes, my opinion is that the formulas for area and perimeter of a rectangle were well known before his time (300BC). The Babylonians in 1500BC knew how to create Pythagorean triples, so I wouldn't be surprised if they knew this. Archimedes did discover more difficult formulas, such as perimeter and area of a circle, and volume of a sphere and a cone.
Any 5 sided polygon is a pentagon. There is no formula for it. We have formulas for area and perimeter. Perhaps that is what you are asking?
SA = BA + ph SA = BA + LA because LA = ph (perimeter x height)
Area : 44cm² Perimeter : 30cm
In which jobs we use perimeter and area?