Write an Equation for a Cross Section of the Parabolic $x ^ { 2 } = 9 y$

question 116

Multiple Choice

Write an equation for a cross section of the parabolic ear (used to hear sounds from a distance) shown in the picture. ​ d = 2.25 inches

• A) \(x ^ { 2 } = 9 y\)
• B)​ \(y ^ { 2 } = \frac { 1 } { 9 } x\)
• C)​ \(x ^ { 2 } = 2.25 y\)
• D)​ \(y ^ { 2 } = 2.25 x\)
• E) \(y ^ { 2 } = 9 x\)

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