Sketch what you would expect the most common shapes seen in fcc metals, an octahedron and a

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Question:

Sketch what you would expect the most common shapes seen in fcc metals, an
octahedron and a cube, would look in an SEM and when imaged in a TEM when they are
oriented in the following directions. Hand drawn sketches are fine, no fancy computer
rendering is needed.
a. [111] direction
b. [110] direction
c. [100] direction