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question 0 0  a manhole cover has a diameter of 3 ft. What is
the length of the brass grip-strip that enciricles the cover,
making it easier to manage?  Tutors, please sign in to answer
this question.  8 Answers  The length of the brass grip-strip
that encircles the manhold cover represents the  Circumference C
of a circle which is given by the formula   C = pi times (the
length of the diameter).   Since the manhold cover has a
diameter of 3 ft = 36 in  then its circumference is
 C = ∏ × (3 ft) = 3∏ ft ≈ 9.42 ft    The length of the brass
grip-strip that encircles the manhold cover approximately  9.42
ft  or exactly 3∏ ft  This seems like you just want to figure
out the circumference of the manhole cover.  The formula for the
circumference of a circle is pi (3.14) multiplied by the
diameter (d) of the circle so, circumference=πd. (π is the
symbol for pi and approx. equals 3.14)  Circumference = πd