What is the area of this triangle?



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units²
A triangle A B C is graphed on a coordinate plane. The horizontal x-axis ranges from negative 5 to 5 in increments of 1. The vertical y-axis ranges from 0 to 5 in increments of 1. The vertex labeled as A lies at begin ordered pair 1 comma 4 end ordered pair. The vertex labeled as B lies at begin ordered pair 4 comma 1 end ordered pair. The vertex labeled as C lies at begin ordered pair negative 4 comma 1 end ordered pair.