Pole heights from similar triangles

Pole heights from similar triangles

Secondary 2
3 marks
TGM Original Questions

Three vertical poles stand on level ground, and their tops are collinear as shown. The middle and shortest poles are \(7\) m and \(3\) m high. Their horizontal separation is \(4\) m; the tallest and middle poles are \(6\) m apart. Find the tallest height.[3]

The right-angled triangles formed by the differences in pole heights are similar.

Solution:

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Answer:\(13\) m.

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