Learn the essential definitions of the parts of a circle. A secant line to a circle is a line that crosses exactly two points ...

Jeff Smith's Math Puzzle for March 20, 2026 - Quadrilateral redux: Anything worth doing is worth doing to wretched excess.

A red circle is inscribed inside a blue square. The arrangement leaves gaps in the square’s four corners, two of which are filled with smaller circles that just barely touch the big red circle and the ...