Multiple choice

Calculate the value of ∠OBC + ∠BAC , if O is the circum-centre of the triangle ABC inscribed in the circle.

  1. 600

  2. 900

  3. 1200

  4. 1300
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

900 (option B) is claimed as correct. However, option labels appear to be degree measures with missing degree symbols. For O as circumcenter: angle OBC = 90° - angle A (property: angle between radius and tangent). angle BAC = angle A. Sum = 90° - A + A = 90°. The labels 600, 900, 1200, 1300 likely mean 60°, 90°, 120°, 130°. Answer B (90°) is mathematically correct.

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