6.1 Review Worksheet (continued)
Determine if each quadrilateral must be a parallelogram. Justify your answer .
28.
29.
30.
Show that the quadrilateral with the given vertices is a parallelogram .
31. J ( − l, 0), K ( − 3, 7), L (2, 6), M (4, − l)
32. P ( − 8, − 4), Q ( − 5, 1), R (1, − 5), S ( − 2, − 10)
33. The toolbox has cantilever trays that pull away from the box so that you can reach the items beneath them. Two congruent brackets connect each tray to the box. Given that AD = BC, how do the brackets AB and CD keep the tray horizontal?
B
C
A
D
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