**Session Author: **Josh Sabloff

This session asks participants to expand their notion of “distance,” using a nontraditional taxicab metric instead of the usual Pythagorean notion. Participants are guided to construct the equivalent of “circles” with this new metric and to look at the intersections of multiple such circles. In particular, two firehouses in Gridtown are a certain distance apart and at specific addresses. What firehouse should serve a given house with a specified address? What areas of town should each firehouse serve? What if there were three firehouses? The focus of the session is on a deeper understanding of the coordinate system and notions of measuring distance.

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**Strategies:**

Problem posing, Multiple representations**Topics:**

Algebra / Arithmetic, Geometry, Problem solving**Styles:**

One rich problem**Mathematical Practices:**MP7