Rule: with any inscribed quadrilateral, the opposite angles are supplementary (they add to 180 degrees)
Based on that rule, we can say
d+100 = 180
d+100-100 = 180-100
d = 80
Answer: 80
No it is NOT possible - that would mean the final angle would also have to be ninety degrees making it a square or rectangle. :)
Answer:
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Step-by-step explanation: