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scZoUnD [109]
3 years ago
7

Find the angle of arc BC

Mathematics
1 answer:
amid [387]3 years ago
6 0

Answer:

   96°

Step-by-step explanation:

The measure of arc EC is twice the measure of ∠DEC, so is ...

  arc EC = 2×68° = 136°

The measure of arc BC is found from the sum of arcs around a circle.

  BC +CE +EB = 360° = BC +136° +128°

  BC = 96° . . . . . subtract 264°

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