Cyclic Compounds: Which Shape is the Most Stable?

[DespicableMe]

Homework Statement

C3H6 cyclopropane
C4H8 cyclobutane
C6H12 cyclohexane

Looking at their bond angles, which do you think is most stable?

The Attempt at a Solution

I'm trying to examine their shapes - triangle, sqaure and hexagon, but I don't know which shape is more stable.

Would a triangle put more strain on the atoms because the angle is shared only among 3 parts?

 

[Borek]

What is hybrydization of carbon in these compounds? What is standard angle for this hybrydization? Where the strain will be lowest?