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S= (5+12+9)/2
S= 26/2
S= 13 m
A= √ s (s-a)(s-b)(s-c)
A= √ 13 (13-5)(13-12)(13-9)
A= √ 13 (8)(1)(4)
A= √ 13 (32)
A=√ 416
A= 20,39 m^2