Use 100 cm fence to form a round field. Please judge whether the area of the field is rational? Please explain the reason Well, I'm a student,

Use 100 cm fence to form a round field. Please judge whether the area of the field is rational? Please explain the reason Well, I'm a student,

Definitely not. Because: 100 cm is the circumference of a circle, so its radius is 50 divided by Pei, and its area is 2500 divided by Pei, which is irrational