Let `a` be a complex number such that `|a|<1a n dz_1, z_2,z_3,... ` be the vertices of a polygon such that `z_k=1+a+a^2+...+a^(k-1)` for all `k=1,2,3, T h e nz_1, z_2` lie within the circle (a)`|z-1/(1-a)|=1/(|a-1|)` (b) `|z+1/(a+1)|=1/(|a+1|)` (c) `|z-1/(1-a)|=|a-1|` (d) `|z+1/(a+1)|=|a+1|`