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OpenStudy (anonymous):
passing out medals....
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OpenStudy (sonyalee77):
sum of 4 interior angles in a quadrilateral is 360 degrees. that is the rule. now, lets solve for x 110+(x+10)+x+90 = 360 2x+210 = 360 2x = 360-210 = 150 hence, x = 150/2 = 75⁰
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