Respuesta :

calculista
the complete question in the attached figure

we know that
The measure of the external angle is the semidifference of the arcs that it covers.
so
m∠BED =(1/2)*[mAC-mBD]-------> solve for mBD
mBD=mAC-2m∠BED
mBD=80-2*25--------> mBD=30°

the answer is
mBD=30°
Ver imagen calculista

Answer:

I believe 30 degrees is the correct answer

Step-by-step explanation:

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