## Precalculus (6th Edition)

Published by Pearson

# Chapter R - Review of Basic Concepts - Chapter R Test Prep - Review Exercises - Page 82: 25

#### Answer

irrational number; real number

#### Work Step by Step

RECALL: (1) $\pi$ is an irrational number. (2) The product of a rational number and an irrational number is an irrational number. (3) All irrational numbers are real numbers. Thus, $\dfrac{4\pi}{5}$ is both an irrational number and a real number.

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