Sectors
Maths and statistics discussion, revision, exam and homework help.
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Re: Sectors70(Original post by Dreamer 160)
what did you get for the answer? -
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Re: SectorsI assume you mean that the sector angle is 80 degrees.(Original post by zed963)
How do I do this question
The diagram shows a sector of a circle.
The area of the sector is 17.453cm^2
Work out the radius of the circle.
Sector =80
Well how do you work out the area of a sector:
,
where
is the sector angle and r is the radius of the circle. So in this question you have
Can you solve this equation to find r?Last edited by notnek; 06-08-2012 at 14:51. -
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Re: SectorsI'm struggling on rearranging it.(Original post by notnek)
I assume you mean that the sector angle is 80 degrees.
Well how do you work out the area of a sector:
,
where is the sector angle and r is the radius of the circle. So in this question you have
Can you solve this equation to find r?
First I would 80/360 = 0.22222 and then 17.4/0.222*pi -
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Re: SectorsYes and so you're left with r^2. So square root your answer to find r.(Original post by zed963)
I'm struggling on rearranging it.
First I would 80/360 = 0.22222 and then 17.4/0.222*pi
When you work it out on your calculator, don't round the numbers like you did in your last post. You should type in
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Re: SectorsThats what I did and I got the answer to be 2.357 but the book states that the answer is 5(Original post by notnek)
Yes and so you're left with r^2. So square root your answer to find r.
When you work it out on your calculator, don't round the numbers like you did in your last post. You should type in
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Re: SectorsI just typed it in and got approximately 5.(Original post by zed963)
Thats what I did and I got the answer to be 2.357 but the book states that the answer is 5
You must be making a calculator error. -
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Re: Sectors(Original post by notnek)
I just typed it in and got approximately 5.
You must be making a calculator error.
True. -
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Re: SectorsYou may want to rephrase what you have just said.(Original post by aliyah.k)
U need help on angles I do not understand them plz help
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Oops yep sorry I need help on angles I don't understand them. Also how to do hard times tables a easy way plz help.(Original post by zed963)
You may want to rephrase what you have just said.
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Re: SectorsWhat aspects of the angles topic do you not understand?(Original post by aliyah.k)
Oops yep sorry I need help on angles I don't understand them. Also how to do hard times tables a easy way plz help.
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What do you consider hard times tables? -
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Re: SectorsA hard stare is usually enough.(Original post by Lunch_Box)
And he can give you detentions. -
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Re: Sectors(Original post by Mr M)
A hard stare is usually enough.
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Re: SectorsThere are tricks out there for multiplying etc. but you should at least know your time table up to 10.(Original post by aliyah.k)
Oops yep sorry I need help on angles I don't understand them. Also how to do hard times tables a easy way plz help.
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As for the angles just watch some videos and read a book about it, if there's a question that your're stuck on then please don't hesitate to post it on the forum.
