?If \(r=\langle x, \ y\rangle, \ r_{1}=\left\langle x_{1}, \ y_{1}\right\rangle\), and
Chapter 11, Problem 48(choose chapter or problem)
If \(r=\langle x, \ y\rangle, \ r_{1}=\left\langle x_{1}, \ y_{1}\right\rangle\), and \(r_{2}=\left\langle x_{2}, \ y_{2}\right\rangle\), describe the set of all points (x, y) such that \(\left|r-r_{1}\right|+\left|r-r_{2}\right|=k\), where \(k>\left|r_{1}-r_{2}\right|\).
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