well it depends on the straw but here's how you can find it ... put a ruler down right on the circle (side) make sure it is symmetrical then measure that and thats the damiter the circumrence is three and one 7th on the diameter
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Circumference is Pi x Diameter so do Circumference divided by Pi to get the diameter :)
diameter = circumference/pi
Circumference = pi*diameter So diameter = circumference/pi = 1.59 units
circumference = diameter * pi. Therefore, diameter = circumference ÷ pi.
Yes because: circumference/diameter = pi and circumference = pi*diameter