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The sum of the angle measures of a quadrilateral is 360°. Write and solve an equation to find the value of x.

The sum of the angle measures of a quadrilateral is 360 Write and solve an equation to find the value of x class=

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Answer:

x = 70

Step-by-step explanation:

The sum of the angle measures of a quadrilateral is 360°

76 + 92 + 122 + x = 360

168 + 122  + x = 360

290  + x = 360

x = 360 - 290

x = 70

You can ever CROSS-CHECK

76 + 92 + 122 + 70

290  + 70

= 360

thus cross-checked

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