At a point, a 20 m above the level of water in a lake the angle of elevation of a cloud is 30 degree the angle of depression of the reflection of the cloud in the lake at A is 60 degrees find the distance of the cloud from A

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At a point, a 20 m above the level of water in a lake the angle of elevation of a cloud is 30 degree the angle of depression of the reflection of the cloud in the lake at A is 60 degrees find the distance of the cloud from A.