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angle arrangement attitude auxiliary vanishing point axis base line center of vision Chapter compatible conform construction line contour lines converge correctly corresponding cube curve defined definition points delineation demonstrated in Figure detail diagram dimensional projections disaligned distance distortion draftsman drawing area edge ellipse elliptical curve equal established example foregoing geometric grid horizon line horizontal plane hypotenuse illustrator inclined plane indicated in Figure intersection isometric leading corner light plane light ray locate point major diameter measuring points normal perspective object oblique projection orthographic parallel perpendicular perspective center perspective construction perspective drawing perspective equivalents perspective projection perspective square picture plane plane geometry procedure properly prow range of vision receding rectangle reference to Figure right-triangle scale lines semicircle shadow shadow lines shown in Figure side spective straight edges struction subdivided surface line tangent tersections tical tion triangle truncation two-point perspective utilized vertical line vertical projections