document.write( "Question 1006809: Show that P(1,2), Q(-11,2) and R(-5,6) are vertices of an isosceles triangle.
\n" ); document.write( "Find the Lengths of all three sides
\n" ); document.write( "PQ=
\n" ); document.write( "QR=
\n" ); document.write( "PR=\r
\n" ); document.write( "\n" ); document.write( "Please help I have no Idea where to start... \n" ); document.write( "

Algebra.Com's Answer #622907 by MathTherapy(10556) $\"\"$ $\"About$

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\n" ); document.write( "Show that P(1,2), Q(-11,2) and R(-5,6) are vertices of an isosceles triangle.
\n" ); document.write( "Find the Lengths of all three sides
\n" ); document.write( "PQ=
\n" ); document.write( "QR=
\n" ); document.write( "PR=\r
\n" ); document.write( "\n" ); document.write( "Please help I have no Idea where to start...
\n" ); document.write( "

Since P & Q have the same y-coordinate, PQ is a HORIZONTAL LINE that's parallel to the x-axis. Its distance is therefore 1 - - 11, or 12. 
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document.write( "Now just use the distance (d) formula:  to find the distances from P(1, 2) to R(- 5, 6) and from Q(- 11, 2) to R(- 5, 6).
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document.write( "These 3 distances should reveal whether ΔPQR is isosceles or not. \n" );
document.write( "

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