An airplane, traveling with a constant engine speed, makes a large and perfect circle parallel to the ground. There is no ...

Evan O’Dorney leaps from his seat and snatches the chalk from his teacher’s hand. “I think it goes like this,” the eighth-grader exclaims. He has come up with a formula for the number of ways to ...

The circumference of a circle = \(\pi d\) or \(2\pi r\). Look at the sector of the circle shown below. To calculate the length of the arc, we need to know what fraction of the circle is shown. To do ...

It’s 10 a.m. on a Saturday at Cal State Fullerton and students are revved up. It’s Math Circle time. Math Circle is a Saturday program for students in second through 12th grade, most of whom are ...

Silva Chang’s Colorado Math Circle recently hosted a Puzzlepalooza competition at the University of Colorado Boulder on December 7. The Colorado Math Circle is an organization directed by Silva Chang ...

Are you ready for this math riddle test? Okay, in today’s math riddle, a series of circle-based numbers is given, which is used as logical arithmetical reasoning to test your mental ability. So, can ...

Now for the important part. Today, as you may know, is Pi Day. Why today? Because it’s March 14—yes, 3/14—and 3.14 is the value of pi to two decimals. Of course, the actual number continues to an ...