It is a 2D measurement because it is only going AROUND the shape. Not in it.
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2*(base) + 2*(height) = perimeter
It must be a perimeter. An area measurement would a square measurement like 56cm². ■
The perimeter is a measurement of the distance around the outline of a shape. The area is the measurement of all the space within the shape, and it is measured as (unit) 2
The angles of a polygon are not directly related to the measurement of the perimeter. If you measure a perimeter of a pentagon in inches and then again in centimetres, the measurement number will change but the pentagon will remain the same.
Exactly as in the question its perimeter is 17 units of measurement