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help you guys plssss and add an explanation

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Answer :

Answer:

100 degrees

Step-by-step explanation:

angles in a quadrilateral (4-sided shape) sum to 360 degrees

so add all the angles up together (80+75+105=260)

and then subtract it from 360 (so it's 100)

Answer:

100 degrees

Step-by-step explanation:

sum of all interior angles of a quadrilateral =360 degrees

80 + 75+ 105=260

360-260=100 degrees

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