Apropos of Nothing

Why does pi even exist? (Happy Upsilon Day)
Why does pi even exist? (Happy Upsilon Day)
How to maximize an area without calculus - using high school math to solve new problems #SoME4
How to maximize an area without calculus - using high school math to solve new problems #SoME4
Why the Trig Identities for Sum and Double-Angle Work
Why the Trig Identities for Sum and Double-Angle Work