lighthouse
You may use the following figure to generate a series of interrelated surveying problems: find the height f the lighthouse (h).
Scroll down to find a set of slides for some suggested problems.
Drag the points of observation to see changes in the angles of elevation.
See how this figure can be modified to generate different problems:
https://youtu.be/iygHMpY3Avs?si=BT35cYewoFjIT5E4
Lighthouse Problems (examples)
Here are the same examples in Google Slides.