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九年级数学练习题中有一道题为:如图,△ABC中,∠C=90°,AB=c,AC=b,BC=a,求其内切圆⊙O的半径r。
Nine years of math exercises have a title: Figure ABC, ∠ C = 90 °, AB = c, AC = b, BC = a, find its inscribed circle ⊙ O radius r.