Find the value of K if area of the trian...

Find the value of K if area of the triangle is 4 sq. unit and vertices are (K,0),(4,0) and (0,4)

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`1/2(x_1(y_2-y_3)+x_2(y_3-y_1)+x_3(y_1-y_2)]=4`
`k(0-4)+4(4-0)+0]=8`
`k=2`.

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