In the diagram below, quadrilateral BAED is a parallelogram, and BD = BC. If angle DBC = 38∘, then find angle EAB, in degrees.
We see that since BDC is an isosceles triangle, so, therefore, angle BDC = angle BCD = x.
38 + 2x = 180
2x = 142
x = 71
From here, we see that angle EDB = 180 - 71 = 109
Used as reference:
https://web2.0calc.com/questions/help-asap-with-geometry
Here's another way to solve it. Because △BCD is isosceles, ∠D=∠C=71
Because BAED is a parallelogram, ∠D=∠E=71.
Extend Point A to M, so it is perpendicular to ¯EC .
∠A=∠EAM+∠MAB
In triangle △AME, ∠EAM=19.
Because ¯AM is perpendicular to ¯BA, ∠MAB=90
Thus, ∠A=90+19=109