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Algebra
Question

Concept Check Draftspeople often use the method s...

Concept Check Draftspeople often use the method shown in the sketch to draw an ellipse. Why does this method work?

Answer

\(\left. \begin{array} { l } { \text { Fixing a string to two points (foci) and } } \\ { \text { sweeping a curve as shown will sketch an ellipse, because the } } \\ { \text { sum of the distances from the two fixed points to the pencil's } } \\ { \text { tip remains constant. } } \end{array} \right.\)

Solution
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