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b/c we know that these triangles both have equal sides... that is given that ab and be are the same length. and that be and cd are parallel , we know that they both are isosceles triangles and that the base angles are the same. The side on ad and ae have equal angles.
so we can make the equation
2a +56 = 180 (b/c we know that around a triangle it's 180°
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