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The perimeter of this rectangle is in dark green.

The perimeter of this rectangle is in dark green.

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  or a hexagon is always equal to adding the length of all the sides together.

Squares
Triangles
Circles
Area
More about Geometry

Bibliography and further reading about geometry:

More about Geometry
More Easy Math
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