81ft is the area of square with side lenghts of 9
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The triangle angle-sum theorem says that all those angles added together equal 180. Therefore, 120+x+x+16=180 and 2x+136=180 and 2x=44. Therefore, x = 22, which is angle B.
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1st - Yes ; 2nd - Yes ; 3rd - Yes ; 4th - No
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