Answer
$\sqrt 5$
Work Step by Step
$d(P_1,P_2)=\sqrt {(x_2-x_1)^2+(y_2-y_1)^2}$ $d((0,0),(2,1)=\sqrt {(2-0)^2+(1-0)^2}=\sqrt {4+1}=\sqrt 5$
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 1 - Graphs - 1.1 The Distance and Midpoint Formulas - 1.1 Assess Your Understanding - Page 7: 19
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