document.write( "Question 1016136: A right triangle whose vertices are A(2,0) , B(-1,4) , and C(-2,-3) . Find the vertex angle whose measure is equal to 90 degree . \n" ); document.write( "

Algebra.Com's Answer #632554 by FrankM(1040) $\"\"$ $\"About$

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slope equation $\"m=%28y2-y1%29%2F%28x2-x1%29\"$ \r
\n" ); document.write( "\n" ); document.write( "This is introduced for the fact that 2 lines which are perpendicular have slopes that are negative reciprocals of each other. So, we'll calculate the slopes formed by the lines joining these points.\r
\n" ); document.write( "\n" ); document.write( "AB - $\"m=%284-0%29%2F%28-1-2%29\"$ $\"m=%284%29%2F%28-3%29\"$ \r
\n" ); document.write( "\n" ); document.write( "BC - $\"m=%28-3-4%29%2F%28-2--1%29\"$ $\"m=%28-7%29%2F%28-1%29\"$ $\"m=%287%29\"$ \r
\n" ); document.write( "\n" ); document.write( "AC - $\"m=%28-3-0%29%2F%28-2-2%29\"$ $\"m=%28-3%29%2F%28-4%29\"$ $\"m=%283%29%2F%284%29\"$ \r
\n" ); document.write( "\n" ); document.write( "Lines AB and AC have slopes which are negative reciprocals, and they meet at point A. \r
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