This item is taken from IGCSE Mathematics (0580) Paper 43 (Extended) of June 2013.
To deal with this item, let us summarize the details of the problem:
(a) Syllabus area: Trigonometry
(b) Specific topic: Length of an Arc
(c) Formula Needed:
It is given that the central angle subtended by the arc (fence) measures 210 degrees. The illustration/photo below shows the sector enclosed by the fence and the central angle.
Using the values given,
Therefore, the length of the fence is 165 m.
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Thank you and God bless!
Thanks a lot, informative
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