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A whispering gallery is an elliptical- shaped room with a dome-shaped ceilling. If two people stand at the foci of the ellipse and whisper, they can hear each other, but others cannot. The maximum length and width of such a hall are 100m and 80m, respectively. Which of hte following equations models the  shape of the hall ? 

A.

x^2/9025+y^2/5625=1

B.

x^2/5625+y^2/9025=1

C.

x^2/2500+y^2/1600=1

D. Both a and b
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সঠিক উত্তরঃ C.

x^2/2500+y^2/1600=1

Explanation: