College Physics (7th Edition)

Published by Pearson
ISBN 10: 0-32160-183-1
ISBN 13: 978-0-32160-183-4

Chapter 1 - Measurement and Problem Solving - Learning Path Questions and Exercises - Conceptual Questions - Page 27: 11


Pi is considered unitless because it is a dimensionless constant.

Work Step by Step

Pi is the relationship between the circumference (c) and the diameter (d) of a circle, both of which are measured in meters. When the two are divided in the formula $pi=c/d$, their units cancel out, leaving pi as a unitless constant.
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