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MATH / In the diagram, four circles of radius 1 with centres P, Q, R, and S are tangent to one another and to the sides of △ABC, as shown. [asy] size(200); pair A, B, C, P, Q, R, S; R=(0,… · Discussion

Discussing In the diagram, four circles of radius 1 with centres P, Q, R, and S are tangent to one another and to the sides of △ABC, as shown. [asy] size(200); pair A, B, C, P, Q, R, S; R=(0,… · MATH

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