A chord of a circle is equal to its radius. The angle subtended

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A chord of a circle is equal to its radius. The angle subtended by this chord at a point on the circumference is

1. 80°
2. 60°
3. 30°
4. 90°

Correct Option: C

According to question , we draw a figure of a circle whose a chord is equal to its radius

OA = OB = AB
∴ ∆ OAB is an equilateral triangle.
∴ ∠AOB = 60°

∴ ∠ACB =	60°	= 30°
	2

Angle subtended at the centre by an arc is twice to that at the circumference.