A person in a whispering gallery standing at one focus of the ellipse can whisper and be heard by a person standing at the other focus because all the sound waves that reach the ceiling are reflected to the other person. If a whispering gallery has a length of 122 meters, and the foci are located 11 meters from the center, find the height of the ceiling at the center.


OpenStax Precalculus

Height: Select an answer dB inches milliseconds meters