[Help] Geometry Question

[javaswing]

Hey guys,

Please help me and solve the question below. (Link to images)
Please post your solutions with steps.

Thanks in advance.

http://i.imgur.com/2MuyoGA.png

http://i.imgur.com/Ia2mj0t.png

[CaptainPanic]

!

Moderator Note

What have you done so far to solve this problem?

 

We cannot distinguish between a student who is very much stuck, and a lazy student who hopes someone else will do the work. Show us what you've done so far, and we'll provide some help.

 

Other members are encouraged NOT to help, until javaswing has convinced us that he's not simply lazy (it's up to everyone individually to judge this).

[michel123456]

Not so obvious, there are many ways to unfold a cube.

 

trying to help: hint, what if R=zero? what would be the shortest distance? Find it then unfold the cube with the 3 involved faces in continuous.

[gabrelov]

whats the problem with that? There are good books in math if you want to begin read Geometry for dummies McIntesh