Respuesta :

we have that

The sum of the interior angles in any triangle must be equal to 180 degrees

so

In the triangle ABE

A+B+E=180

substitute given values

60+55+E=180

E=65 degrees

so

mRemember that

m by vertical angles

so

mIn the triangle EDC

msubstitute given values

65+85+D=180

D=30 degrees

m

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