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12 September, 12:16

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

Write and solve an equation to find the value of x.

The three known numbers are 100 120 and 100

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  1. 12 September, 15:56
    0
    Answer:40

    Step-by-step explanation:

    100+120+100+x=360

    320+x=360

    collect like terms

    x=360-320

    x=40
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