Question

In fig. O is the centre of the circle. If angle ACB = 30°, then find angle ABC.
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Answer 1

Answer:

ABC is also 30°

because triangle ABC is a equilateral triangle and it's three angles are same

Answer 2

Answer:

∠ABC = 60°

Step-by-step explanation:

∠CAB = 90° (Angle in the semi-circle is 90°) In △ABC ∠ABC + ∠BCA + ∠CAB = 180° ∠ABC + 30° + 90° = 180° ∠ABC = 180° – 120° ∠ABC = 60°