## Cylinder Axis checking

##### 9:35 AM, Monday January 24th 2022

Hello,

I'm working on the 250 cylinder challenge and I have a question. I've drawn my cylinders and I would like to check if the alignement is correct.

https://imgur.com/gallery/HgZez3c

It is said in the instructions that I should take a pen of a different colour and try to ignore the minor axis that has already been drawn. My problem is that I don't see how to ignore the axis. As the minor eIlipses shoud be cut in half in the middle I tried to use the ruler this way. I place my ruler in the middle of the first ellipse and measure the space in centimeters. I divide the figure in 2. I place a point. Then I do the same for the other ellipse. Finally I use the points as marking and trace minor nb2 (the one with a different color). My problem is that this method doesn't seem to work.

Could someone please share his/her tricks when placing the ruler for checking? How can I be sure that my ruler is on the right place and is going to help me to draw the correct minor axis?

Thanks very much in advance for the help!

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##### 2:10 PM, Monday January 24th 2022

Why don't you rotate the page until the minor axis become horizontal? After that, estimate the center of for each elipse, and draw a line perpendicular to each minor axis.

##### 8:19 AM, Monday January 31st 2022

I took back my page and tried as you said to put the minor axis horizontally but then how do I know wich one is correct?

https://imgur.com/gallery/HgZez3c

https://imgur.com/gallery/X1ilJTF

Any comments on my try to find the center is welcome. Thanks again for your help!

##### 8:59 AM, Tuesday March 15th 2022

Could someone please have a look (using the link I put above) to my work on cylinders and give his/ her opinion if I've done the checking correctly?

I've made the challenge once but I could get the badge because my axis were not correct in my cylinders and also because I didn't know how to check.

Thanks in advance for remarks and critics.

##### 9:01 AM, Tuesday March 15th 2022

Could someone please have a look (using the link I put above) to my work on cylinders and give his/ her opinion if I've done the checking correctly?

I've made the challenge once but I could get the badge because my axis were not correct in my cylinders and also because I didn't know how to check.

Thanks in advance for remarks and critics.

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