No. It is 1/pi where pi is the irrational number which is approximately equal to 3.14159
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The relationship of a circles circumference to it's diameter is Pi x diameter. So a 1cm diameter circle will have a circumference of 3.142 cm to the third d.p.
The circumference of a circle is pi times the diameter. If you want a third of that, divide by 3. (Pi is approximately 3.14) Then to get the perimeter add the diameter to the circumference of the 1/3 of the circle.
circumference = diameter X pi pi = 3.1416 circumference = one meter X 3.1416 = 3.1416 meters
Circumference is Pi x Diameter so do Circumference divided by Pi to get the diameter :)
diameter = circumference/pi