An arc of length 10.8 cm subtends an angle of 1.2 radians at the centre
FURTHER MATHEMATICSWAEC 2009
An arc of length 10.8 cm subtends an angle of 1.2 radians at the centre of a circle. Calculate the radius of the circle.
- A. 12.6 cm
- B. 12.0 cm
- C. 9.6 cm
- D. 9.0 cm
Correct Answer: D. 9.0 cm
Explanation
Length of arc (in radians) = \(r \theta\)
\(10.8 = 1.2r\)
\(r = \frac{10.8}{1.2} = 9.0 cm\)
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