# Chapter 1 - Section 1.9 - Distance and Midpoint Formulas; Circles - Exercise Set: 2

$5$ units

#### Work Step by Step

Use the distance formula $d=\sqrt{(x_1-x_2)^2+(y_1-y_2)^2}$ to obtain: $d=\sqrt{(5-8)^2+(1-5)^2} \\d=\sqrt{(-3)^2+(-4)^2} \\d=\sqrt{9+16} \\d=\sqrt{25} \\d=5$

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