I°) Definition
| Consider two intersecting lines A and D.
The projection of a point M on the straight line D parallel to the line A is the point M', the intersection of D with the right parallel to A through M. Note: |
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II°) Definition of the orthogonal projection of a point
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The orthogonal projection of a point M on the line D is the point M', the intersection line D and perpendicular to D through M. |
| A segment [AB] is projected in a segment [A'B '] and its midpoint I is projected into I' middle of [A'B'].
Knowing that I was the middle of [AB], we can say that I' is the midpoint of [A' B']. |
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