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  3. 4 an elliptical whispering gallery is 10 m long an

4 An elliptical whispering gallery is 10 m long Anna and Francis find that if...

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4 An elliptical whispering gallery is 10 m long Anna and Francis find that if they each stand 4 m away from the ends of the gallery at its foci they can hear each other perfectly What is the width of the gallery

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