The o-to-o-to-o bond angle in an ozone (o3) molecule is not exactly 120° because

There is an extra pair of electrons bound to the central oxygen. This set of electrons repels against the other electrons surrounding the outside oxygen molecules, compressing the bond angle more than if another atom were present in its place. The actual angle size is around 116 degrees, noticeably smaller than the 120 degrees present in a trigonal planar structure.

For cyclohexane compounds drawn in a chair conformation:   -axial bonds are vertical  -equatorial bonds are parallel to two bonds within the ring.  thus, as i assume the chair conformation is drawn:   -the x group is in an axial position, as are the five other vertical bonds.  -three axial bonds are on the top face of the ring  -the other three axial bonds are on the bottom face  the position of the second substituent on each ring carbon is equatorial.  gauche groups must be on an adjacent carbon such as carbon 6 and carbon 2, and also gauche groups are rotated by 60 degrees relative to each other.  drawing the newman projections for c1–c2 and c1–c6 aids in visualizing the groups that are gauche to the y group on c1.  click this link and watch some academic videos that may you more understand the topic 

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