Pi is a real number
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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.
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No because the circumference of a circle is pi times diameter and pi is an irrational number
Pi is an irrational number, meaning it cannot be expressed as a simple fraction. As such, pi cannot be divided evenly by any non-zero integer, including itself. In other words, pi is not divisible by any whole number.