Mathematics, 26.11.2019 05:31 Courtneymorris19
Acompany designed and sells an ultrasonic receiver, which detects sounds unable to be heard by human ear. the receiver can detect mechanical and electrical sounds such as leaking gases, air, corona, and motor friction noises. it can also hear bats, insects, and even beading water. the receiver is 21 in deep. the focus is 7 in from the vertex. find the diameter of the outside edge of the receiver.
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