Answer
$\text{unit}$
Work Step by Step
A circle whose center is at the origin and has a radius of $1$ unit, its equation is $x^2+y^2=1$.
This is called the unit circle.
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Chapter F - Foundations: A Prelude to Functions - Section F.4 Circles - F.4 Assess Your Understanding - Page 38: 6
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