Take any two real numbers x, y in the interval [0,1], and calculate the probability of the event "x ^ 2 + y ^ 2 > 1 is constant"

Take the origin as the center of the circle, 1 as the radius, and then cross the origin (0,1) (1,0) (1,1) to make a square
It can be expressed in the first quadrant (square area circle area) / square area, i.e. 1 - π / 4

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