Respuesta :

Answer: m<D = 80º

Step-by-step explanation:

Since we know triangle ABC is congruent to triangle EDC, the angle 60º can be know for angle ACB. Triangles have a interior total of 180, so 40+60 is 100. Subtract 100 from 180 to get your angle of B. Since the triangles are similar we know that B=D so D=80º

The answe is 80 degrees
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