Precalculus (10th Edition)

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 8: 69

Answer

A)The desired intersection point is $\left( 2.65,\,1.6 \right)$. B)The distance from the point $\left( 1.4,1.3 \right)$ to the midpoint of the shortest side $\left( 2.65,\,1.6 \right)$ is $1.2855$.

Work Step by Step

(a) The desired intersection point is the midpoint of the shortest side. End points of the shortest side of the error triangle are $\left( 2.7,\,1.7 \right)$ and $\left( 2.6,\,1.5 \right)$. Here, ${{P}_{1}}=\left( {{x}_{1}},{{y}_{1}} \right)=\left( 2.7,\,1.7 \right)$ and ${{P}_{2}}=\left( {{x}_{2}},{{y}_{2}} \right)=\left( 2.6,\,1.5 \right)$ By the midpoint formula $\left( x,\,y \right)=\left( \frac{2.7+2.6}{2},\,\frac{1.7+1.5}{2} \right)$ $\left( x,\,y \right)=\left( \frac{5.3}{2},\,\frac{3.2}{2} \right)$ $\left( x,\,y \right)=\left( 2.65,\,1.6 \right)$ Thus, the midpoint of the shortest side is $\left( 2.65,\,1.6 \right)$ Therefore, the desired intersection point is $\left( 2.65,\,1.6 \right)$ (b) From part (a), The midpoint of the shortest side is $\left( 2.65,\,1.6 \right)$. The opposite vertex of the triangle is $\left( 1.4,1.3 \right)$. To find the distance from the point $\left( 1.4,1.3 \right)$ to point $\left( 2.65,\,1.6 \right)$: By using the distance formula $d=\sqrt{{{\left( 2.65-1.4 \right)}^{2}}+{{\left( 1.6-1.3 \right)}^{2}}}$ $d=\sqrt{{{\left( 1.25 \right)}^{2}}+{{\left( 0.3 \right)}^{2}}}$ $d=\sqrt{1.5625+0.09}$ $d=\sqrt{1.6525}$ $d\approx 1.2855$ Therefore, the distance between the right fielder and second base is approximately $1.2855$
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