[DOI] [PubMed] [Google Scholar] 21.Canapp SO, Jr, Farese JP, Schultz GS, Gowda S, Ishak AM, Swaim SF, Vangilder J, Lee-Ambrose L, Martin FG
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To write the equation for the triangle, simply find the common \(x\)-coordinate \(k\), the common \(y\)-coordinate \(m\), and the common \(z\)-coordinate \(n\), determine whether the triangle is up or down, and then write the appropriate equation: $$(x \geq k) \cap (y \geq m) \cap (z \geq n)$$ or $$(x \leq k) \cap (y \leq m) \cap (z \leq n)$$ The triangle is up if the \(y\)-coordinate of the vertex not on the line \(y = m\) is bigger than \(m\)
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