document.write( "Question 398171: Hai Sir, please help me on this problem, i got stuck \r
\n" ); document.write( "\n" ); document.write( "1)Show that the points (-2,5),(3,-4) and(7,10)are the vertices of a right angled isosceles triangle.
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Algebra.Com's Answer #282120 by ewatrrr(24785)\"\" \"About 
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document.write( "Hi, 
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document.write( "A(3,-4),B(-2,5),  and C(7,10)
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document.write( "A. Show that triangle ABC is an isosceles triangle
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document.write( "A(3,-4),B(-2,5),  and C(7,10)
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document.write( "distance AB = \"sqrt%28+%285%29%5E2+%2B+%28-9%5E2%29%29\"= distance AC = \"sqrt%289%5E2+%2B%28-2%29%5E2+%29\"\r
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document.write( "B. Show that triangle ABC is a right triangle
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document.write( " m of AB = \"%28-4-5%29+%2F%28+3-%28-2%29%29+=+-9%2F5+\"
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document.write( " m of BC = -5/-9 = 5/9
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document.write( " SLOPES negative reciprocals, lines AB and BC perpendicular, ∠ABC = 90° \n" );
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