there are these old-fashioned looking drawings... (quick search, didn't find the old ones, but similar to these) https://mathematicaldaily.weebly.com/secant-c

there are these old-fashioned looking drawings... (quick search, didn't find the old ones, but similar to these) https://mathematicaldaily.weebly.com/secant-cosecant-cotangent.html https://mathematicaldaily.weebly.com/secant-cosecant-cotange... https://www.pinterest.com/pin/enter-image-description-here--354869645630505834/ https://www.pinterest.com/pin/enter-image-description-here--... ... which were not used in my education but whenever i saw them i wished they had been, they lay out a geometric interpretation of all of them. by "old" i mean "look like Leonardo drew them"