Traditional Culture Encyclopedia - Photography and portraiture - The photography of point D on the plane ABC falls on BE, why can we get the verticality of the plane?
The photography of point D on the plane ABC falls on BE, why can we get the verticality of the plane?
The projection of d on the bottom ABC is e.
∴
DE⊥ plane ABC
∴
DE⊥AB
If a straight line is perpendicular to a plane, it is perpendicular to any straight line in the plane. )
You are ∵DF⊥AB.
DF∩DE=D
(that is, two straight lines intersect)
∴
AB⊥ plane DEF (If a straight line is perpendicular to two intersecting straight lines respectively, then this straight line is perpendicular to these two intersecting straight lines.
A plane formed by straight lines)
? AB again? Aircraft ABD
∴
Plane ABD⊥ Plane definition
(If a straight line is perpendicular to a plane, then the plane intersecting the straight line is perpendicular to the plane. )
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