Texas HS Geometry Question of the Day

Use a clinometer (or phone inclinometer) to measure the angle, measure the horizontal distance with a tape, and apply right-triangle trigonometry $h = d\tan(\theta)$.

Pace off the distance and estimate the angle by eye, then use similar triangles for a rough height.

Take a photo of the tower and measure on-screen angles in geometry software, scaling by the tower's apparent width.

Place an approximate sketch on a coordinate grid, guess coordinates for the top and base, and use the distance formula.