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What is the fourth measure

What is the fourth measure-example-1

1 Answer

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Answer: 60 degrees

Step-by-step explanation: The interior angles of a quadrilateral add up to be 360 degrees.

100 + 120 + 80 + x (your unknown angle) = 360.

Add up all the angles

300 + x = 360

Subtract 300 to isolate x

x = 60

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