jMol series zig-zag nanotube

Here is a single-walled (10,0) carbon nanotube with zig-zag (as opposed to arm-chair) chirality. What is it's diameter? (Hint: double-click on two atoms to draw a scale-bar between them.)

When a 2-wall internally-capped tube model is constructed, we'll compare it to the image below of a 15-wall nanotube with a 6-wall internal closure:

The above image is tiny part of a much larger image of multi-walled carbon nanotubes lying like straight sticks of uncooked spaghetti after falling out of the box into a pot on the stove.

For more nano-tube and nano-cone models, check out Steffen Weber's jnanotube applet.
Skip to model five here.