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irakobra [83]
3 years ago
6

Help please 15 point and explanation would be great

Mathematics
1 answer:
scZoUnD [109]3 years ago
7 0

Answer:

C) 70°

Step-by-step explanation:

whole circle = 360°

inscribed angle theorem  says that the measure of inscribed angle = 1/2 measure of intercepted arc

m∠DCB =1/2 m arc DB

46° = 1/2 m arc DB multiply  both sides by 2

92° = m arc DB

m arc DC = 360° - 92° -128° = 140°

m ∠DBC = 1/2 m arc DC = 1/2*140° = 70°°

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