Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

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.1 The Distance and Midpoint Formulas - F.1 Assess Your Understanding - Page 6: 15


$\sqrt 5$

Work Step by Step

$(x_{1},y_{1}) = (0,0)$ $ (x_{2},y_{2}) = (2,1)$ $[d(P_1,P_2)^{2} = (x_{2}-x_{1})^{2}+(y_{2}-y_{1})^{2}$= $(2-0)^{2}+(1-0)^{2}= 4+1=5$ $d(P_1,P_2) = \sqrt 5$
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