Lecture 1 (Calculus) Pythagorean Thm, Trig Functions, Unit Circle, Sets, Relations, and Functions

How is π precisely defined?

1. A.As approximately 3.14159, the well-known constant
2. B.As the ratio of circumference to diameter
3. C.As the area of a circle of unit radius
4. D.As the radian measure of 180 degrees