I was interviewing for a semiconductor intern position. One of the first questions was to estimate how many devices you could fit on a wafer after giving me the

I was interviewing for a semiconductor intern position. One of the first questions was to estimate how many devices you could fit on a wafer after giving me the wafer diameter and the size of a single device. Simple right? Just work out the area of the wafer and divide by the area of a single device. Except for some reason, I cannot for the life of me remember the area of a circle. I'm freaking out at this point, seconds are passing and I can't write down the equation for a circle. Suddenly, after digging deep in my memory, I remember the onion method [0] and work out the area to be pi*r^2. The guy is staring at me like I am insane for showing my working for the area of a circle... Next question, he writes a bunch of letters on the whiteboard and tells me to create as many electrical equations as I can. I get V=IR instantly and then just stared blankly at the board. I couldn't remember anything else. He thanks me for my time and obviously I don't get the job. I interviewed with another team at the company that asked a bunch of Verilog and C questions, it went much better and they made me an offer. I rejected because I couldn't face working in the vicinity of the first interviewer. I hope I never meet him again in my life... [0]https://en.wikipedia.org/wiki/Area_of_a_circle#Onion_proof https://en.wikipedia.org/wiki/Area_of_a_circle#Onion_proof