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2007 AMC 10B Problem 4

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2007 AMC 10B Problem 4AMC 10 Step by Step
Name:                             Date: September 13, 2026
Circles · difficulty 2 of 5 · about 2 min · position P1-10

The point OO is the center of the circle circumscribed about △ABC,\triangle ABC, with ∠BOC=120∘\angle BOC=120^\circ and ∠AOB=140∘,\angle AOB=140^\circ, as shown. What is the degree measure of ∠ABC?\angle ABC?

  1. A)

    3535

  2. B)

    4040

  3. C)

    4545

  4. D)

    5050

  5. E)

    6060

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