## Backbone of Perspective |

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abcd axes axis OA base broken line circle circular disc cone cos2 cos2a cos2b cos2c cosines cube curve cut DD cut the perspective cut vertical cutting the horizon cylinder dimensions remaining draw lines parallel draw rays Draw the perspective drop a perpendicular elevation equal eye height face Figure Figure 17 Find shadow find the perspective Find the shadow ground line height of eye horizontal plane horizontal projection Isometric Join located one-half dimetric parallel to axis perpendicu perpendicular to cut perspective in problem perspective plane plane MN point of intersection points draw problem 20 ratios ray of light right angles right triangle shadow of line side sin2a sin2b sin2c source of light spective plane straight line tan2a tan2b tan2c three-fourths tion true height line true length vanishing point vertical line vertical projection vertical trace