Geometrymedium · Past Paper
In a circle, chord AB = chord AC. If angle BAC = 40 degrees, find angle ABC.
A40 degrees
B70 degrees
C100 degrees
D140 degrees
✓ Correct Answer: B — 70 degrees
Triangle ABC is isosceles (AB=AC). Angle ABC = (180 - 40) / 2 = 70 degrees.
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