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There are two pi bonds.
it because pid has the derivative part ,which will predict the disturbance .so helps in antisipating the errors & correcting them in advance.
Circumference (C) equal pi (3.14159...) times diameter (d).So, diameter (d) equals Circumference (C) divided by pi (3.14159...).d=C/pid=2m/pid=0.63661977236 meters.
Oh, dude, you're hitting me with some chemistry now! So, the oxalate ion C2O4^2- has two double bonds, which means it has two pi bonds. It's like the cool kid in chemistry class with those two pi bonds, making it all stable and stuff.
Pi ( 3.142 approx.) is the amount of times the diameter of a circle can be measured along the circumference of a circle. We know that Pi multiplied by the diameter of the circle is equal to it circumference. So we write C=PiD This means, as it says above, that a certain number of "Pi's" will be equal to the circumference.