![If a line intersects two concentric circles (circles with the same center) with center O at A, B, C and D, prove that AB = CD If a line intersects two concentric circles (circles with the same center) with center O at A, B, C and D, prove that AB = CD](https://d138zd1ktt9iqe.cloudfront.net/media/seo_landing_files/10-4-6-1564735852.png)
If a line intersects two concentric circles (circles with the same center) with center O at A, B, C and D, prove that AB = CD
![boolean algebra - Simplifying $A'B'C'D+A'B'CD+A'BC'D'+A'BC'D+A'BCD'+AB'C'D '+AB'C'D+ABC'D'+ABCD'+ABCD$ to $A'B'D+A'C'D+AB'C'+ABC+BD'$ (and another) - Mathematics Stack Exchange boolean algebra - Simplifying $A'B'C'D+A'B'CD+A'BC'D'+A'BC'D+A'BCD'+AB'C'D '+AB'C'D+ABC'D'+ABCD'+ABCD$ to $A'B'D+A'C'D+AB'C'+ABC+BD'$ (and another) - Mathematics Stack Exchange](https://i.stack.imgur.com/77rsK.jpg)
boolean algebra - Simplifying $A'B'C'D+A'B'CD+A'BC'D'+A'BC'D+A'BCD'+AB'C'D '+AB'C'D+ABC'D'+ABCD'+ABCD$ to $A'B'D+A'C'D+AB'C'+ABC+BD'$ (and another) - Mathematics Stack Exchange
![Matematica de la A la Z - Clasa 4 - Culegere de exercitii si probleme + CD - C. Istrate, D. Macean, M. Koszorus, N. Todoran - 9786065283244 - Libris Matematica de la A la Z - Clasa 4 - Culegere de exercitii si probleme + CD - C. Istrate, D. Macean, M. Koszorus, N. Todoran - 9786065283244 - Libris](https://cdn4.libris.ro/img/pozeprod/1061/1060959-1.jpg)