
Mary H. answered 11/20/14
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The sum of the measures of the 4 angles is 360, so the equation is...
Angle E + Angle D + Angle B + Angle C = 360
85 + 21x + 6 + 21x + 1 + 25x = 360
Combine terms.
67x + 92 = 360
Subtract 92
67x = 268
Divide by 67
x = 4
So, Angle D = 21*4 + 6 = 84 + 6 = 90
Angle B = 21*4 + 1 = 84 + 1 = 85
Angle C = 25x = 25*4 = 100
Angle E = 85
Check: 90 + 85 + 100 + 85 = 360
Hope it helps, Nathan.
Mary Ann