Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 9 Quadratic Relations and Conic Sections - 9.3 Graph and Write Equations of Circles - 9.3 Exercises - Skill Practice - Page 630: 59


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Work Step by Step

Find the distance between two points $(-3,5)$ and $(-6,2)$: $d_1=\sqrt (-3-0)^2+(5-0)^2=\sqrt 34\\d_2=\sqrt (-6-0)^2+(2-0)^2=\sqrt 40$ Hence, the equations in standard form for three circles centered at the origin is $\sqrt 34 \lt r \lt \sqrt 40$
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