"Imagination is more important than knowledge. For knowledge is limited to all we now know and understand, while imagination embraces the entire world, and all there ever will be to know and understand."
— Albert Einstein

"PI Day is celebrated on March 14th (3/14) around the world. PI (the Greek letter π) is the symbol used in mathmatics to represent a constant — the ratio of the circumference of a circle to its diameter — which is approximately 3.14159."
— piday.org

2π radians = 360°
π/180 radians = 1°