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[" In a "Delta ABC," if "(c+a+b)(a+b-c)=...

[" In a "Delta ABC," if "(c+a+b)(a+b-c)=ab," then the measure of angle "C" is "],[[" (a) "(pi)/(3)," (b) "(pi)/(6)," (c) "(2 pi)/(3)," (d) "(pi)/(2)]]

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