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document.write( "Triangle ABC has vertices A (-5, 4), B (1, -2) and C (3, 6),
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document.write( "That triangle is:\r\n" );
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document.write( "(a)Write the equation of the line of which AB is a segment.
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document.write( "That's the green line below:\r\n" );
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document.write( "(b)Write the equation of the line of which the altitude to line AC is a segment.
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document.write( "That's the blue line below:\r\n" );
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document.write( "Since it is an altitude, it is perpendicular to AC.\r\n" );
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document.write( "First we find the slope of AC:\r\n" );
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document.write( "The blue line is perpendicular to AC so its slope is\r\n" );
document.write( "the reciprocal of 
with the opposite sign, so the\r\n" );
document.write( "blue line's slope is 
and it passes through B(1,-2)\r\n" );
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document.write( "(c) Write the equation of the perpendicular bisector of line AC.
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document.write( "We find the midpoint of AC, using the midpoint formula:\r\n" );
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document.write( "Midpoint = (
,
) = (
,
) = (
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) = M(-1,5)\r\n" );
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document.write( "Now we find the equation of the red line through M(-1,5), it has the same \r\n" );
document.write( "slope as the altitude since both are perpendicular to the line AC.\r\n" );
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document.write( "The red line's slope is also but it passes through M(-1,5)\r\n" );
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document.write( "(d)Find the perimeter of triangle ABC.
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document.write( "We use the distance formula to find the lengths of all three sides.\r\n" );
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document.write( "So the perimeter = AB + BC + AC = 
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document.write( "Edwin
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document.write( "![\"\"](\"/images/stars/stars-13.gif\")
