Video narration
A tower casts a 20‑meter shadow. The sun’s angle of elevation is shown in the problem, but the value is missing or garbled. We can still set it up. Draw a right triangle: the tower is the vertical side, the shadow is the 20 m base, and the sun ray is the slanted side. At the tip of the shadow, mark the angle of elevation, call it θ. Then use tangent: tan(θ) = height ÷ 20. So the tower’s height is 20·tan(θ) meters. Once you know θ, plug it in to get the number.