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oksano4ka [1.4K]
3 years ago
10

If mBC = mBD =140 degrees then What is m

Mathematics
2 answers:
VLD [36.1K]3 years ago
8 0

9514 1404 393

Answer:

  40°

Step-by-step explanation:

The sum of arcs of a circle is 360°, so the measure of arc CD is ...

  CB +BD +CD = 360°

  CD = 360° -140° -140° = 80°

The measure of inscribed angle B is half the measure of the arc it subtends:

  ∠B = arc CD/2 = 80°/2

  ∠B = 40°

Dmitry_Shevchenko [17]3 years ago
8 0

Answer:

40 degrees

Step-by-step explanation:

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