document.write( "Question 363854: 1.A Triangle Has Vertices at A(3,2) B(4,0) C(8,2).
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Algebra.Com's Answer #259516 by ewatrrr(24785) $\"\"$ $\"About$

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document.write( "Hi, 
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document.write( "a. Show the triangle is right angled
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document.write( "mAB = -2/1  mBC = 2/4 = 1/2   
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document.write( "AB is perpendicular to BC as their slopes are negative reciprocals.
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document.write( "b.  Co-ordinates of the Point D such that ABCD is a rectangle
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document.write( "BC and AD would be parallel and have same slope = 1/2
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document.write( "y = 1/2x + b Using point (3,2) b = -1/2
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document.write( "y = .5x + .5 (red line) mCD = -2  CD meets AD at (7,4)\r
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