Find the value of x please thank you

asked Jan 24, 2021 40.2k views

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4 votes

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Work Shown:

For any convex quadrilateral, the interior angles always add up to 360.

80+3x+x+3x = 360

7x+80 = 360

7x = 360-80

7x = 280

x = 280/7

x = 40

Dana answered Jan 30, 2021

by Dana

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