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Hi,

I'm looking for help with the first question in this page. I'm only given the radius (which presumably isn't enough) and I have to work out the angle.

I know I'm missing an observational thing I can use in the question, any help would be great.

Thanks.
2. Re: Sectors, Arcs and Radians
Hint: You have been given three sides of the triangle OCD.
3. Re: Sectors, Arcs and Radians
(Original post by Spoon123)

Hi,

I'm looking for help with the first question in this page. I'm only given the radius (which presumably isn't enough) and I have to work out the angle.

I know I'm missing an observational thing I can use in the question, any help would be great.

Thanks.
See the diagram below:

Use the triangle highlighted in green to find the angle.

Hint: You need to use the cosine rule.

See the spoiler if you still can't do it.

Spoiler:
Show

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Last updated: May 10, 2012
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