To ensure that the perimeter is not measured too short or too long
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Yes - you need to return precisely to the starting-point.
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A triangle with sides of 2.4, 2.4 and 3.4, will have a perimeter of 8.1. Remember to include the unit of measure in your answer.
Perimeter is in feet and not in square feet
A perimeter doesn't have a shape. It's just a distance ... a number and a length unit. It's the distance an ant has to walk in order to go all the way around something and return to where he started.
To measure the perimeter of a garden, you take measuring tape (preferably the flexible aluminum kind) and measure all of the edges. When you've done so, add the number of feet from each of the sides and the answer will be the perimeter of your garden.
The perimeter is a measure of distance equal to the sum of all sides of a polygon.