The perimeter of a shape is the distance around the outside. For a shape with straight sides, the perimeter is the sum of the length of the sides. The perimeter of a circle is called the circumference, and is calculated by multiplying the diameter by pi.
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-- Measure or figure out the length of each side. -- Add up all the lengths of all the sides. -- The answer is the perimeter of the shape.
The outside of a shape.
measure the sides then ad them together
The measure of a perimeter is the total length of all sides of a geometric shape, so any shape with a combination of sides whose total is 27 would yield this perimeter.
If the shape is a regular polygon or curve there are formula for each shape. If the shape is irregular you will have to measure each piece of the shape's edge and sum all the pieces together.