**Concept: The question tests on Geometry**

**Solution:**

By the rule of Secants which intersect outside a circle, angle APB =1/2(AB−CD)

Arc angle AB = 2 * ∠APB + CD

= (2 * 40) + 20 = 100

Option A

Modified on: Tue, 12 Oct, 2021 at 2:15 PM

**Concept: The question tests on Geometry**

**Solution:**

By the rule of Secants which intersect outside a circle, angle APB =1/2(AB−CD)

Arc angle AB = 2 * ∠APB + CD

= (2 * 40) + 20 = 100

Option A

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