Lydia graphed ΔDEF at the coordinates D (-2, - 1), E (-2, 2), and F (0, 0). She thinks ΔDEF is a right triangle. Is Lydia's assertion correct?
Yes; the slopes of segment EF and segment DF are opposite reciprocals.
Yes; the slopes of segment EF and segment DF are the same.
No; the slopes of segment EF and segment DF are not opposite reciprocals.
No; the slopes of segment EF. and segment DF are not the same.
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