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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`degree` in a distance of `40m e

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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`degree` in a distance of `40m e t r e s` ?
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We know, length of the arc ` = r*theta`
Here, `theta` is in radians.
`:. 40 = r*25(pi/180)`
`=> r = (40*180)/(25pi) = 288/pi = 91.6m`
So, the required radius is `91.6m.`
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