A railroad tunnel is shaped like a semi-ellipse. The height of the tunnel at the center is 18 feet and the vertical clearance must be 6 feet at a point 16 feet from the center. Find an equation for the conic.

Circle d circumscribes abc and abe. which statements about the triangles are true? statement i: the perpendicular bisectors of abc intersect at the same point as those of abe. statement ii: the distance from c to d is the same as the distance from d to e. statement iii: bisects cde. statement iv: the angle bisectors of abc intersect at the same point as those of abe. a. i only b. i and ii c. ii and iv d. i and iii e. iii and iv