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3 cards from this section. Quick, good the night before a test.
Define a normal vector in the context of 3D geometry.
Think about its role in describing planes.
What is the significance of the angle between two planes?
Consider how this relates to orientations.
What formula is used to find the angle between two planes?
Think about the properties of dot products.
True or False: Two planes are parallel if their normal vectors are perpendicular to each other.
Recall the definition of parallelism.
Given the planes with normal vectors n₁ = (a, b, c) and n₂ = (d, e, f), express the angle between them in terms of these variables.
Use general variables to derive a symbolic expression.
If the angle between two planes is 60°, find the relationship between their normal vectors.
You could set up an equation representing their relationship.
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