posted by Anonymous .
The state highway commission has decided to build a bridge over a dangerous railroad crossing. The approach ramp has to be constructed so that the bridge is 10 meters above the track. If the maximum desired grade of this ramp is 4 degrees, how far back from the edge of the bridge must the ramp start?
look at it as a triangle
Angle is 4 degree
tan of 4 =
Side opposite(10m)/ Side adjacent
distance required = Side adjacent =
10 / tan 4