well i wouldn't know.. im heree to figure out what the answer is [=
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71.8 metres does not define a shape and so does not have any particular perimeter.
It isn't clear how you would define the "perimeter" for a 3D figure. The base is the product of length x width.
Multiply the area squared minus the radius
The perimeter of a rectangle is length + width x 2 = perimeter. * * * * * That is misleading since that would be evaluated as L + W2 or L + 2W. The perimeter of any polygon is the sum of the lengths of its sides. A rectangle has two sides of the same length (L) and the other two of the same width (W). So the perimeter is 2*L + 2*W or 2*(L + W).
That depends on exactly what you want to 'do' to it or with it. Do you want to calculate it ? Spell it ? Define it ? Walk around it ? Send it in Morse Code ? The perimeter of an area or object is the total distance around its boundary. Measure each side with a ruler, yardstick, tape measure, etc. Then add all of these numbers together, and you have the perimeter.