Asked by Jack
                One angle of a quadrilateral has a measure a°. Find the average of a measures of the other three angles. 
            
            
        Answers
                    Answered by
            Damon
            
    a + sum = 360
sum = (360 -a)
average = sum/3 = (360-a)/3 or 120 - a/3
    
sum = (360 -a)
average = sum/3 = (360-a)/3 or 120 - a/3
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