Michael Oluwafemi Taiwo, Ph.D [This piece is dedicated to the memory of my high school math teacher and friend, Mr. Yusuf, who passed away this year after a protracted battle with illness] One of the earliest topics I fell in love with in Mathematics is Angles of Elevation and Depression. It is at the heart of trigonometry. The questions are usually simple: you had a triangle, and given the length of the sides, are required to find the magnitude of the angles between them. Sometimes, for a right-angled triangle (one with a 90-degree angle), you were given the angle […]