Never come across "circumfrance". The word circumference is normally used in the context of a circle or circular objects, not polygons. However, by extending the definition, the circumference of a triangle can be interpreted as its perimeter, which is the sum of the lengths of its three sides.
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8
125.6 feet
mutiply by pi 3.14159265.............................................
Circumference = 2*pi*radius or diameter*pi
circumference = 2*pi*5