In RT △ ABC, ∠ C = 90 °, AC = 5, BC = 12, if the circle with C as the center and R as the radius has a common point with the hypotenuse AB, the value range of R is obtained

In RT △ ABC, ∠ C = 90 °, AC = 5, BC = 12, if the circle with C as the center and R as the radius has a common point with the hypotenuse AB, the value range of R is obtained

Make CD ⊥ AB in D, as shown in the figure, ∵ ∠ C = 90 °, AC = 5, BC = 12, ∵ AB = ac2 + BC2 = 13, ∵ 12CD · AB = 12bc · AC, ∵ CD = 6013, ∵ when the circle with C as the center and R as the radius has a common point with the hypotenuse AB, the value range of R is 6013 ≤ R ≤ 12