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OpenStudy (lovelyharmonics):
semiellipse
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OpenStudy (lovelyharmonics):
A railroad tunnel is shaped like a semiellipse as shown below. |dw:1402778771045:dw| The height of the tunnel at the center is 54 ft and the vertical clearance must be 18 ft at a point 8 ft from the center. Find an equation for the ellipse.
OpenStudy (lovelyharmonics):
what does '18 ft at a point 8 ft' mean?
OpenStudy (lovelyharmonics):
X^2/A^2 + Y^2/B^2 = 1 8^2/A^2 + (18/54)^2 = 1 64/A^2 = 1 - 1/9 = 8/9 and then what do i do?
OpenStudy (lovelyharmonics):
please :/ @Luigi0210 @mathmale @hartnn
hartnn (hartnn):
|dw:1402779712314:dw|
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