sanctus Posted September 25, 2020 Report Share Posted September 25, 2020 So when planning for a camping trip, I ended up wondering how one calculates the diameter of a rolled camping madrass will be when you know the length,height (and width) of the flattened madrass. What I find fun is that I had it in the back of my back a few days, never actually sat down to analyze, till I found the solution. Of course waaaay easier (and even straight forward once one properly thinks about it) than I ever thought at first 🙂 Not spoiling you the fun, but for dimension 2*200*80 answer is 15.96 OceanBreeze 1 Quote Link to comment Share on other sites More sharing options...
sanctus Posted September 25, 2020 Author Report Share Posted September 25, 2020 Of course assuming no air in the rolled layers Quote Link to comment Share on other sites More sharing options...
OceanBreeze Posted September 26, 2020 Report Share Posted September 26, 2020 I get 22.56 cm and since you didn’t show your work, I’m not showing mine.😊 lukasm 1 Quote Link to comment Share on other sites More sharing options...
sanctus Posted October 1, 2020 Author Report Share Posted October 1, 2020 This asks for it: YOu show me yours I show you mine :D:D:D:D Quote Link to comment Share on other sites More sharing options...
sanctus Posted October 1, 2020 Author Report Share Posted October 1, 2020 Mine is: Get area of side of madrass then find radius of circle with same area. so 2*200=r^2*2pi -->r=(200/pi)^(0.5) ---> >>> np.sqrt(200/3.14) #7.9808688446762215 But asked ofor diameter so: >>> np.sqrt(200/3.14)*2 15.961737689352443 Â Quote Link to comment Share on other sites More sharing options...
sanctus Posted October 1, 2020 Author Report Share Posted October 1, 2020 Ok you win, long time no geometry I guess. Area of circle is pi r^2 not 2pi r^2... So I also get: 22.573305919324014 OceanBreeze 1 Quote Link to comment Share on other sites More sharing options...
OceanBreeze Posted October 1, 2020 Report Share Posted October 1, 2020 What do I win? Â By the way, since you are an admin can you please look into why LaTex formulas do not render here? If you click on the <> symbol you get a box with a drop down menu where LaTex can be selected, but I am not sure what tags to use to get LaTex to work. I tried the usual [math] and [latex] and also $$ and $ as well as a couple of others and it doesn't work. Is the LaTex plugin actually installed? Â Thanks Quote Link to comment Share on other sites More sharing options...
sanctus Posted October 1, 2020 Author Report Share Posted October 1, 2020 \alpha [latex]\frac{1}{2}[/latex] Quote Link to comment Share on other sites More sharing options...
sanctus Posted October 1, 2020 Author Report Share Posted October 1, 2020 Not sure how to fix it, did not find usefull stuff in adminCP, but am no guru at this  Quote Link to comment Share on other sites More sharing options...
CountryBoy Posted January 4, 2021 Report Share Posted January 4, 2021 "madrass"= "mattress" in what language? Quote Link to comment Share on other sites More sharing options...
HallsofIvy Posted March 20, 2021 Report Share Posted March 20, 2021 On 1/4/2021 at 9:39 AM, CountryBoy said: "madrass"= "mattress" in what language? Oh, I see, it is a matress in Madras! Quote Link to comment Share on other sites More sharing options...
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