Question 1101923
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Obviously, the centers of the rods (in the section) form equilateral triangle with the side length of 3 cm.  (3 cm = 1.5 cm + 1.5 cm).


So, add 3 + 3 + 3 = 9 centimeters for the length of the 3 linear elements of the band. 

Then add to it three times the length of the arc of the circle of the radius 1.5 cm and the central angle of 120 degrees.


So, the final answer is  {{{9 + 2*pi*1.5}}} = {{{9 + 3*pi}}} centimeters.
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