Angle Between Line and Plane (sin φ = |d·n|/(|d||n|) where φ is angle between line and plane)

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sin φ = |d·n|/(|d||n|) where φ is angle between line and plane

What each symbol means

SymbolWhat it stands for
dLine direction
nPlane normal

When to use this

φ is complement to angle between d and n: sin φ = cos(angle(d,n)) in acute sense.