1. If the slope of AB = the slope CD , and the slope of AD = the slope of BC , then ABCD is a parallelogram.
2. <M and <L are supplementary, so
8x+1 + 16x - 13 = 180
24x - 12 = 180
24x = 192
x = 8
<K = <M therefore
m<K = 8x+1 = 8(8) +1 = 64+1 = 65 degrees
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