The value of x is 20 degrees if the sum of the angle measures of a quadrilateral is 360°.
What is quadrilateral?
It is defined as the four-sided polygon in geometry having four edges and four corners.
The properties of the quadrilateral:
Two pairs of congruent sides.
It has one pair of opposite congruent angles.
The diagonals of a kite are perpendicular.
One diagonal is bisected.
The question is incomplete.
The complete question is in the picture, please refer to the attached picture.
It is given that:
As we know the sum of the in the quadrilateral is 360 degrees
From the diagram:
100 + 120 + 100 + x = 360
The above equation in one variable can be used to find the value of x.
320 + x = 360
x = 360 - 320
x = 20 degrees
Thus, the value of x is 20 degrees if the sum of the angle measures of a quadrilateral is 360°.
Learn more about the quadrilateral here:
brainly.com/question/6321910
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