Sides of triangleABC, AB=7 cm, BC=5cm, C...

Sides of `triangleABC, AB=7 cm, BC=5cm, CA=6cm`. A pole is stand at mid point of side `AC`. Angle of elevation of pole from vertex `B` is `30^@`, find height of pole (a) `sqrt7/sqrt3` (b) `(2sqrt7)/sqrt3` (c) `2sqrt21` (d) `2sqrt7`

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