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Several students are invited to join a group to solve a problem when they log into the Math Forum. Four of them agree to participate. They are given a name for their group and instructions on how to proceed.

The students leave messages in a discussion area to set up a time to work together on the problem. They check in periodically and agree upon a time.

At the agreed upon time, they log into the “Taxicab Geometry” problem site at the Math Forum. They are in a chat area associated with a shared whiteboard. On the whiteboard is a statement of the problem and a diagram (see Figure 1). The problem is to explore geometry on a grid.

The taxicab drivers in Gridville have their own version of geometry to help them find their way around efficiently. The streets in Gridville form a perfect grid, with streets one block away from each other.

The following questions are posed for partial submissions:

  1. What are the taxicab-lengths of routes A, B and C in the map of Gridville?
  2. What is the formula for the shortest taxicab-distance along the grid between any point P at (j, k) and any other point Q at (m, n) on the grid ?
  3. Draw a taxicab-circle of all points that are a distance 4 blocks from a center point.
  4. What is the taxicab-distance around that taxicab-circle with taxicab radius of 4 blocks?
  5. What is the formula for the taxicab-circumference of a taxicab-circle of taxicab-radius R?
  6. What is the area of a taxicab-circle of taxicab-radius R?
  7. What is the value of taxicab-pi? Remember that taxicab-circumference = 2 x taxicab-pi x taxicab-radius ?
  8. What is the taxicab-area of a taxicab-circle?

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Last edited October 4, 2003 1:51 pm by GerryStahl (diff)