From definitions 1-3 in axiom 3, it can be seen that since the change in direction implies the infinite accumulation of finite quantities, and the result of the change in direction is a quantitative continuum, the perimeter and diameter are parts of the quantitative continuum, which follows the mathematical characteristics of axiom 3 to define infinity (it cannot be reached by forever extending finite quantities), Therefore, we obtain the exact infinite value of π. This value is 1, and the perimeter and diameter are infinite values, but here they have lost the characteristics of comparable size (that is, the mathematical characteristics of the gradual increase or decrease of the quantity value in axiom 2).