An arc of a bridge is semi-elliptical wi...

An arc of a bridge is semi-elliptical with major axis horizontal. If the length of the base is 9 m and highest part of the bridge is 3 m from the base, then what will be the best approximation of the height of the arch 2 m from the centre of the base?

`(11)/(4) m `

`(8)/(3) m`

`(7)/(2) m`

`2m`

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