Keepin' it Mathematical (Kind of like keepin' it real, only cooler. Obviously)

We made a rainy day trip to the library today to work on our research projects (more info to come!). As we passed a woman getting out of her car, Noah looked at her with a perplexed look and informed me that he thought the woman was me. "Your head looks very similar to that girl." :)    Madison, just to be clear, asked a necessary question: "Do you mean similar, or congruent?"