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Sectional plane inclined to VP is called as Auxillary Vertical plane, then why is a sectional plane inclined to HP called as Auxillary Inclined Plane?

closed as off-topic by usr2564301, Lucian, WELZ, mayersdesign, Luciano Nov 26 '18 at 9:25

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Auxiliary inclined plane (blue) is not horizontal, think it as a tilted horizontal(=green) plane. Auxiliary VP is still vertical. It's parallel with Z axis. AIP is parallel with X or Y axis.

enter image description here

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