Controlling the orientation of triangular contour plates?

Question:How can I control the orientation of triangular contour plates?Which side of the triangle is considered to be the length or the width, or when I inquire the part in drawings?Answer:There are

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Aerodynamics of Airfoil Sections – Introduction to Aerospace

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Aerodynamics of Airfoil Sections – Introduction to Aerospace

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A principled representation of elongated structures using heatmaps