Triangle area!!

Geometry Level pending

Find the area of the above triangle ِ\( ABC \) in terms of \( n,m, r, \) and \(s\).

I- \( \large {\frac{ | ns - rm| }{2} }\)

II- \( \large {\frac{ rm - ns }{2}} \)

III- \( \large {\frac{ns - rm}{2}} \)

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