Calculating x, angle CED.
Notice.
AB = DE, and BC = CD.
Let BC = CD = 1 unit.
a = 180-100
a =. 80°
a is angle ACB.
b = 180-65-a
b = 180-145
b = 35°
b is angle BAC.
(c/sin80) = (1/sin35)
c = 1.71695992129 units.
c is AB = DE.
It Implies, x, angle CED is;
x = b, angle BAC.
x = 35°
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