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2025 AMC 10B Problem 5

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2025 AMC 10B Problem 5AMC 10 Step by Step
Name:                             Date: September 13, 2026
Circles · difficulty 2 of 5 · about 2 min · position P1-10

In △ABC\triangle ABC , AB=10AB=10 , AC=18AC=18 , and ∠B=130∘.\angle B=130^\circ. Let OO be the center of the circle containing AA , BB , and C.C. What is the degree measure of ∠CAO\angle CAO ?

  1. A)

    2020

  2. B)

    3030

  3. C)

    4040

  4. D)

    5050

  5. E)

    6060

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