Geometry and TrigonometryHardChord under a 60-degree central angle
Geometry and Trigonometry practice question
Points A and B lie on a circle with centre O, and angle AOB measures 60°. If the radius of the circle is 6, what is the length of chord AB?
Answer: 6
OA = OB = 6 and the angle between them is 60°, so triangle AOB is equilateral and AB = 6.
Common wrong answers
- If you answered 3
- 3 halves the radius.
- If you answered 12
- 12 is the diameter.
- If you answered 6.28
- 6.28 is the arc length, 2π(6)/6.
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