Question 1019862
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Hi,
  *[illustration parallelogram.png].
X = (4a- 40)°   and  Z = (2a - 8)°
Question States***
X + Z + X + Z = 360 |Opposite angles Equal
2(4a-40) + 2(2a-8) = 360  |Opposite angles Equal
12a = 360 + 80 + 16
a = 38
the angles of the parallelogram are: = 112°{{{4a-40}}} and 68°  {{{2a-8}}}
CHECKING our answer***
2*112 + 2*68=  = 224 + 136 = 360