Solve the Problem. -The Reflective Property of an Ellipse Is Used in Lithotripsy

question 40

Multiple Choice

Solve the problem.
-The reflective property of an ellipse is used in lithotripsy. Lithotripsy is a technique for treating kidney stones without surgery. Instead, high-energy shock waves are emitted from one focus of an
Elliptical shell and reflected painlessly to a patient's kidney stone located at the other focus. The
Vibration from the shock waves shatters the stone into pieces small enough to pass through the
Patient's urine. A vertical cross section of a lithotripter is in the shape of a semiellipse with the dimensions shown.
Approximate the distance from the center along the major axis where the patient's kidney stone should be
Located so the shock waves will target the stone. Round to two decimal places.

• A) 16.87 cm. below the center
• B) 24.95 cm. below the center
• C) 14.91 cm. below the center
• D) 40.57 cm. below the center

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