As I mentioned, there are many ways to solve these problems; some involve circles, some don't. Actually, it is not so much a matter of solving as of...
If you draw in a radius from center O to the top of segment x1 or x2, you have a right triangle with the hypotenuse and the horizontal leg known. Use...
As I understand it, your friend took the answers to the first 20 questions, all of which are numbers from 1 to 4, and wrote an expression (function)...
Start by writing out the binomial theorem itself. Then look for a part that you can turn into a 2, and a part that you can turn into -1 (probably by...
You're right, one must always use fractions, not decimal approximations, in solving a Diophantine equation. (enoimreh7, have you learned the standard...
I was a software engineer for many years, and have been teaching at a community college since 2004. Since 1998, I was a part of Ask Doctor Math (http://mathforum.org/dr.math/ and now http://themathdoctors.org/).