use [ 2π radius arc length ] ; radius here is x { = y² / 9 }.....arc length is √ ( 1 + [ 2 y / 9 ]²) dy , y in [ 3 , 5 ].....will need the sub of 2y/9 = tan Θ
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use [ 2π radius arc length ] ; radius here is x { = y² / 9 }.....arc length is √ ( 1 + [ 2 y / 9 ]²) dy , y in [ 3 , 5 ].....will need the sub of 2y/9 = tan Θ