Pi equals= 3.14159 26535 89793 23846 26433 83279 50288 41971 69399 37510.
This is to 50 decimal places.
You can just write it as 3.142. Even at A level maths, you don't have to write out the whole thing.
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Pi is a real number
It the radius is r then the area is pi*r*r - which is pi times a rational number. pi is an irrational number, so the multiple of pi and a rational number is irrational.
pi minus pi is zero. Any number minus itself is zero.
To find a number in Pi, see the link below
No because the circumference of a circle is pi times diameter and pi is an irrational number