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Elden [556K]
3 years ago
14

Find the value of x which ABCD must be a parallellogram? x =

Mathematics
1 answer:
svetoff [14.1K]3 years ago
3 0
ABCD\ is\ parallelogram\ then\ :\\\\\underbrace{15x+2=9x+20}_{alternate\ angles}\ \ \ |subtract\ 2\ from\ both\ sides\\\\15x=9x+18\ \ \ \ |subtract\ 9x\ from\ both\ sides\\\\6x=18\ \ \ \ |divide\ both\ sides\ by\ 6\\\\\boxed{x=3}
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