What Equation Relates Pi to the Circumference of a Circle

question 11

Multiple Choice

What equation relates pi to the circumference of a circle?

• A) C = 2πr (where r is the radius of the circle)
• B) C = πr (where r is the radius of the circle)
• C) C = 2πd (where d is the diameter of the circle)
• D) C = 2πa (where a is the area of the circle)

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Definitions:

Karl Marx

A 19th-century philosopher, economist, and political theorist, whose ideas about class struggle and capitalism laid the foundation for Marxist theory.

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