The perimeter of a square or a triangle is the distance all the way around the edge - the green strip in this picture. The circumference of a circle is also its perimeter. The perimeter of a quadrilateral, like a square or a rectangle, is always equal to twice the length plus twice the width. The perimeter of a triangle is always equal to adding the length of all three sides together.
Bibliography and further reading about geometry:
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- Carr, K.E. . Quatr.us Study Guides, . Web. 27 March, 2017