C = π r ² Where 'C' is the circumference of a circle, 'r' is the radius, and is π = 3.14. When measured, the radius (r) of the circle is 5":
C = 3.14 x 5² C = 3.14 x (5 x 5) C = 3.14 x 25 C = 78.5 The circumference of the circle is 78.5 "
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