Mathematics, 22.08.2019 19:10, gransazer863

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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Lydia graphed δdef at the coordinates d (−2, −1), e (−2, 2), and f (0, 0). she thinks δdef is a righ...