The distance round a closed figure is the perimeter.
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The distance around a closed plane figure is called the perimeter. The perimeter of a figure can be calculated by adding together the lengths of each side.
Perimeter
It means you have found the distance around that figure.
yes, a triangle is a closed figure
A perimeter is the distance around two-dimensional shapes. The circumference is the distance around a circle. Typically the distance around polygons is a perimeter and circumference is used for closed curves.