Question 1144212
Show that the points A(-2,6), B (5,3), C (-1,-11), and D (-8,-8) are vertices of a rectangle.
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Find the slopes of the 4 sides.
If consecutive sides are perpendicular, the angles are 90 degs, it's a rectangle.
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If the 2 diagonals, AC and BD, are equal length, it's a rectangle.