Calculate the distance of the top of the building from A and B if they are both on the same side of the building
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The distance from A to the base of thr building is hcot25=htan65 where h is the height of the building; the distance from B is hcot37=htan53. The distance between A and B is h(tan65-tan53)=57 so h=57/(tan65-tan53)=69.73m or 70m to the nearest metre.

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