railway DFCCIL Executive 2025 Mock Test Quantitative Aptitude Geometry Circles, Chords and Tangents

PA and PB are tangents to a circle with centre Q, from a point P outside the circle, and A and B are points on the circle. If ∠APB = 40°, then ∠OAB is equal to:

1
50°
2
40°
3
25°
4
20°
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