The sum of the lengths of all the sides.
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A triangle has side lengths of 3, 4, and 5. The perimeter is 12 total. Perimeter is the total length of the outside of the object.
It is the total length "outline" of a figure. For example, the total length of the outline of a square, its perimeter, is the total length of the four sides of the square.
To find the ratio of the length of a shape to its perimeter, you would divide the length by the perimeter. For example, if the length of a rectangle is 4 units and its perimeter is 12 units, the ratio would be 4/12 or 1/3. This ratio represents the proportion of the length to the total distance around the shape.
It is the perimeter
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.