Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Published by Pearson
ISBN 10: 0-32184-874-8
ISBN 13: 978-0-32184-874-1

Chapter 13 - Conic Sections - 13.1 Conic Sections: Parabolas and Circles - 13.1 Exercise Set - Page 854: 54

Answer

Center of the circle is $\left( 0,1 \right)$ and radius is $r=\frac{1}{5}$

Work Step by Step

Standard equation of the circle is: ${{\left( x-h \right)}^{2}}+{{\left( y-k \right)}^{2}}={{r}^{2}}$ (equation - 1) And the equation of the circle is ${{x}^{2}}+{{\left( y-1 \right)}^{2}}=\frac{1}{25}$ (equation - 2) Now compare both the equations. $\begin{align} & {{x}^{2}}+{{\left( y-1 \right)}^{2}}=\frac{1}{25} \\ & {{\left( x-\left( 0 \right) \right)}^{2}}+{{\left( y-\left( 1 \right) \right)}^{2}}={{\left( \frac{1}{5} \right)}^{2}} \\ \end{align}$ Center coordinate of circle is $\left( h=0,k=1 \right)$. And radius of circle is $r=\frac{1}{5}$. To graph, we plot the points $\left( 0,1.45 \right)$, $\left( 0,0.55 \right)$, $\left( -0.45,1 \right)$, and $\left( 0.45,1 \right)$ which are, respectively, $\frac{1}{5}$ units above, below, left and right of $\left( 0,1 \right)$.
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