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Calculation of area of an orthogonal projection

작성자 Uploader : corona 작성일 Upload Date: 2018-09-11변경일 Update Date: 2018-09-12조회수 View : 288

Theorem for the orthogonal prlojection

1. If a straight line "a" is not perpendicular
to a plane α, the orthogonal projection of
the line a to the plane α is a line.

2. Let the orthogonal projection of a line segment AB to the plane α as A`B` and the angle between AB and α as θ:
A`B` = AB*cos(θ)

3. For a figure having its area S1 on the plane β, the area S2 of its orthogonal projection to the plane α at the angle θ is calculated as :
S2=S1*cos(θ)

*** 참고문헌[References] ***

S2 = S1*cos(θ)

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Calculation of area of an orthogonal projection

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