### Jefferson Barracks Bridge Mathematics Projects

Latitude/longitude coordinates are (38.486876,-90.277018)

The parabolic arch of the JB Bridge has a height of 182
feet over a span of 909 feet.

Project #1

A. Find the equation for the parabola that represents the
JB Bridge.

B. Graph the arch of the bridge using a large sheet of
graph paper.

C. Find the arc length of the parabola.

Project # 2 (Consortium, No. 53, Spring 1995, ISSN 0889 5392)
"Geometry St. Louis Style" by William V. Thayer gave some data
about the horizontal cable distance of 49 feet between each set
with eight sets of cables from the center to one end of the bridge.

Show that the cable sets are located at intervals of 49.061,
49.424, 50.143, 51.202, 52.581, 54.256, 56.200, 58.386,
and 77.985 feet along the parabola.

Also find the angle between the cable set and the tangent to the
parabola at each location.

Thanks COMAP!

Copyright © 1999

with all rights reserved by

William V. Thayer, PedLog

Home Page URL http://www.jug.net/wt">

For more information and ideas about working with parabola projects you may link to a page
written by one of the following math artists:
Danielle,
Darlene,
Kellie,
Jill,
Nanyal,
Kevin,
Crystal,
Rachel,
Christina,
Jennifer,
Candice,
Vincent
Esther and
Melinda.
Most of us are in this picture but not in order of
names.