Esteban decids to try and work out the height of a pyramid in Egypt.
At a distance of 520 meters from the center of the pyramid, he discovers a vertical column 5 meters high.
When he moves another 20 meters away and looks towards the pyramid, he sees that the top of the pillar and the top of the pyramid are aligned.
Esteban calculates that the height of the pyramid is 135 meters. Is he correct?