R Rino D New member Mar 16, 2012 #1 an arch of an underpass is a semi ellipse 60 ft wide and 20ft high. Find the clearance at the edge of a lane if the edge is 20ft from the middle.
an arch of an underpass is a semi ellipse 60 ft wide and 20ft high. Find the clearance at the edge of a lane if the edge is 20ft from the middle.
