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2 years ago

If = 80°, and m∠BED = 25°, what is ? 55° 30° 65° 20°

Mathematics

1 answer:

Tomtit [17]2 years ago

5 0

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°

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