We're going over the reactivity of aromatic compounds so I was reviewing material over Sn1 and Sn2 reactions. In the book that we have, it says that the smaller the bong length between two carbons, or other atom, in a cyclic compound, the smaller the bond angle. That's where I get confused. Using similar triangles, we can see that no matter how long the arms, the angle stays the same. So how is it that the smaller the bong length, the shorter the bond angle? Does the shorter length contribute to a higher steric strain or increased repulsion of electrons on the bonded atoms? Or is my geometry just really rusty?