Answer
Notice that the methyl groups are farther apart in the more stable state conformation of cis-1,3-dimethylcyclobutane. This indicates less repulsion.
Work Step by Step
Examine the groups on pages 76 and 77. Notice that the methyl groups are farther apart in the more stable state conformation of cis-1,3-dimethylcyclobutane. This indicates less repulsion.
