alleryJoining two solids at their flat faces hides those faces:
AOutside
BAbove all
CBelow all
DInside
Answer & Solution
Correct answer: D. Inside
1. The two flat faces are pressed together at the join.
2. Nothing of them shows on the finished surface.
3. So they end up inside the new solid.
_Source: syllabus Mathematics, Chapter 13, Surface Areas and Volumes._
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