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Consider the parallelotrams shown in the...

Consider the parallelotrams shown in the figure below representing two-dimensional cells.

a. Which of these are primitive and which are multiple unit cells? Are any of these orthogonal?
c. What is the relation between the radius of circle and the length of parallelogram for the unit cell shown in the figure below (space filling diagram)?

d. How many nearest neighbour circles does a given circle have in the second figure abov?
e. What is the radius of the triangular hole shown in the second figure above?
f. What is the packing fraction of the unit cell in the second figure above?

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