4 cercles dans un triangle.

Let ∆ABC be any triangle with a radius of incircle, r Let a be the radius of the circle tangent to r, AB, and AC Let b be the radius of the circle tangent to r, AB, and BC Let c be the radius of the circle tangent to r, AC, and BC Construct ∆ABC if a = 1 cm, b = 4 cm, and c= 9 cm

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