Dilating in 3D | Solid geometry | High school geometry | Khan Academy
The cross-sections of a pyramid parallel to its base are the dilations of the base about the apex with scale factors from 0 to 1. View more lessons or practice this subject at https://www.khanacademy.org/math/geometry/hs-geo-solids/hs-geo-2d-vs-3d . Kha
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