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# Circles Question help! watch

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1. The points A and B lie on the circumference of a circle with center O and radius 8.5 cm. The point C lies on the major Arc AB. Given that <ACB= 0.4 radians, calculate the length of the minor arc AB

Thanks.
2. (Original post by DOJO)
The points A and B lie on the circumference of a circle with center O and radius 8.5 cm. The point C lies on the major Arc AB. Given that <ACB= 0.4 radians, calculate the length of the minor arc AB
Thanks.
Use the circle theorem relating angle subtended by a chord at the centre, compared with that at the circumference, to calculate AOB.

The length of an arc is r theta where r is the radius and theta the angle subtended at the centre.

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