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[" 19.If in a triangle "ABC,(s-a)(s-b)(s...

[" 19.If in a triangle "ABC,(s-a)(s-b)(s-c)," then angle "C" is equal to "],[[" (A) "90^(@)," (B) "45^(@)],[" (C) "30^(@)," (D) "60^(@)]]

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