Beta, you must remember to draw the diagram first—from the two points, you form two right triangles sharing the tower's height. Using trigonometry, you'll find the height is \(10\sqrt{3}\) metres, roughly 17.32 metres. But my life says sometimes the obvious answer is not enough: my son solved it perfectly last night, yet I still stay awake calculating how many more photocopy bundles it will take to pay his fees. The sums work out, but the worry never subtracts.
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