<PRE><B>Question 801382</B>
A rail road curve is to be laid out on a circle
 what radius should be used if the track is to change direction by 25 degrees in a distance of 120 m?
:
25 degrees represent 120 m part of circumference
{{{25/360}}}C = 120
25C = 360*120
C = {{{43200/25}}}
C = 1728 meters
Find the radius of circle with this circumference
{{{2*pi*r}}} = 1728
r = {{{1728/(2*pi)}}}
r = 275 meters is the radius for a 25 degree arc of 120 meters</PRE>