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The circumference is the diameter times pi. It will always be approximate because of the nature of pi. In this case, it's approximately 50.2654825
Well, the easiest way would be to press 'pi =' on a calculator, and round it to 2 d.p. Pi is the ratio between the circumference and diameter of a circle. C=pi*d. It exists in nature, and can be seen by looking at a circle. In this way, pi can be measured.
probobly because pi equals 3.14 and you can make 3.14 negative so yes you can have negative pi
3.14 is short for pi. Pi can go on forever and ever. It's just a rounded number of pi to make things easier to understand.
According to Kanada, the ten decimal digits ending in position one trillion are 6680122702. However due to the irrational nature of pi, a true end cannot be found.