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Maths Question GCSE

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Suzannew | 12:11 Sat 21st Jan 2006 | Quizzes & Puzzles
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Hi, homework question, sorry not sure where to post it.


How can I find the angle in a sector of a circle, if I know what the radius and arc length of the sector are?

How can I find the radius of a circle, if I know what the arc length of the sector and the centre angle of the sector are?


Thanks for the help

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2 Pi r = circumference


find ratio of arc length to circumference (eg 1:4)


apply this ratio to 360deg (eg would give you 90deg)


For the 2nd one. Find ratio of angle to 360deg then apply ratio to arc length to find circumference and use Pi to find diameter half of which is your radius.


I hope this works as it is a long, long time since I did GCSE.



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Thanks for your help Jim :)

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