Exercises on the area of a triangle

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Questions on the area of a triangle:    (x₁,y₁)       (x₂,y₂)           (x₃,y₃)
Find the area of the triangle abc  where a(,),  b(,)and c(,)

1/2 ¦ (-)+(-)+(-)¦
1/2 ¦ ++¦          
1/2 ¦ ¦ = units
Enter your answer here to the nearest one place of decimals     

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