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Browse High School Coordinate Plane Geometry
Stars indicate particularly interesting answers or
good places to begin browsing.
 When is a Slope 0 or Undefined? [3/29/1997]

How do I know when the slope of an equation is zero or undefined (no
slope)?
 Where Will the Runners Meet? [03/29/1999]

Two runners, A and B, start 90 degrees away from each other on a circular
track and run at the same speed. If Runner B decides to cut across the
track, where will they meet?
 Why Does dxdy = rdrd(theta)? Why Not Just drd(theta)? [12/29/2009]

In transforming from rectangular form to polar form, I have always
memorized dxdy = rdrd(theta) without understanding it....
 Why Use h and k for the Center of a Circle? [05/09/2000]

Why are k and h used in the equation (xh)^2 + (yk)^2 = 0 for a circle
with center (h,k)? Why not j and f, etc.?
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