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common rail disel injection
A common vertex is a single fixed point which multiple angles share a vertex on.
A Duval triangle is an equilateral trinagle used in the dissolved gas analysis of transformer oil. The ratios of ethylene, methane, and acetylene are plotted on the sides of the triangle. A line is then drawn from each point to a common intersection point. Where that common point falls determines the diagnosis of the problem.
Single-point perspective uses only one vanishing point, whereas multiple-point perspective uses two or more vanishing points.
The sides of a triangle do not meet in a point, so there is no "the common point".