Gcse circle question | Revision Server | Page 1

viral smelt Nov 5, 2022, 7:09 PM

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whered u find the question from?

kindred nebula Nov 5, 2022, 7:10 PM

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it was just on a workbook my teacher gave me

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they got a whole load of questions and put them on a separate workbook

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Idk where they got it from originally

viral smelt Nov 5, 2022, 7:11 PM

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are they all for gcse edexcel?

kindred nebula Nov 5, 2022, 7:12 PM

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no its for gcse higher aqa

viral smelt Nov 5, 2022, 7:14 PM

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ok icl idk how to do this im yr11, all i know is radius from OB(larger circle) is 17 and radius from OA(smaller circle) is 11

kindred nebula Nov 5, 2022, 7:16 PM

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yeah idk what to do after that though😂

viral smelt Nov 5, 2022, 7:16 PM

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could find area of segment

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90/360 x 11^2

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one sec lemme work this out

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on paper

kindred nebula Nov 5, 2022, 7:17 PM

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Okays, thanks!

viral smelt Nov 5, 2022, 7:20 PM

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got 21.43 for the shaded region

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not sure if its correct tho,

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nvm got it wrong, one sec

kindred nebula Nov 5, 2022, 7:22 PM

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Ive just done it on paper and got 55.9

viral smelt Nov 5, 2022, 7:22 PM

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55.98229

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yeah

kindred nebula Nov 5, 2022, 7:22 PM

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yeah thats what i got

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which method did you solve it?

viral smelt Nov 5, 2022, 7:23 PM

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yeah seems right then

normal gorge Nov 5, 2022, 7:23 PM

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viral smelt got 21.43 for the shaded region

its perimeter

viral smelt Nov 5, 2022, 7:23 PM

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used the area to find the diameter

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then subtracted the arc of the smaller from larger

kindred nebula Nov 5, 2022, 7:23 PM

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is the area the 289 and the 121?

normal gorge Nov 5, 2022, 7:23 PM

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you dont need the area tho the =289 is r^2

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so r is sqrt(289) = 17

viral smelt Nov 5, 2022, 7:24 PM

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289 is the radius squared

normal gorge Nov 5, 2022, 7:24 PM

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yeah

kindred nebula Nov 5, 2022, 7:24 PM

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yeah so its 17

copper dune Nov 5, 2022, 7:24 PM

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U can form 2 sectors

normal gorge Nov 5, 2022, 7:24 PM

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im struggling to see where area comes here

copper dune Nov 5, 2022, 7:24 PM

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find the arc length

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s

kindred nebula Nov 5, 2022, 7:24 PM

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square root 289

normal gorge Nov 5, 2022, 7:24 PM

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square root 289 is the radius

viral smelt Nov 5, 2022, 7:24 PM

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it doesnt,

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how many decimal places does it want it?

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the answe*

kindred nebula Nov 5, 2022, 7:24 PM

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doesnt say

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just says work out the perimeter

normal gorge Nov 5, 2022, 7:25 PM

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just do like 1dp

viral smelt Nov 5, 2022, 7:25 PM

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viral smelt 55.98229

do 56 then

kindred nebula Nov 5, 2022, 7:26 PM

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yeah ill just put 56 down because there isn't a unit of measurement either

viral smelt Nov 5, 2022, 7:26 PM

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yep

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btw the equation for a circle is x^2 + y^2 = r^2

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so act accordingly to any values you see substiuted in the equation

kindred nebula Nov 5, 2022, 7:27 PM

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viral smelt btw the equation for a circle is x^2 + y^2 = r^2

Ah that makes much more sense, i didn't know this and was guessing.

viral smelt Nov 5, 2022, 7:28 PM

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viral smelt btw the equation for a circle is x^2 + y^2 = r^2

forgot to say this is only for when the centre of the circle is (0,0), but thats usually the case in GCSE maths

kindred nebula Nov 5, 2022, 7:28 PM

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Yeah, this has to be like a grade 9 question, right?

viral smelt Nov 5, 2022, 7:29 PM

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not sure, because theres 2 steps to it, just hard knowing what to do after finding the radius of both circles

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probably 7-8

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i do edexcel, so not sure about the pattern of these questions in aqa

kindred nebula Nov 5, 2022, 7:31 PM

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Damn i thought it would have been higher haha

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I think grade boundaries are lower for aqa

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so yeah probably like grade 8

viral smelt Nov 5, 2022, 7:31 PM

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kindred nebula so yeah probably like grade 8

yeah solid 8

kindred nebula Nov 5, 2022, 7:31 PM

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I think ive figured this out, Thanks everyone for your help it is much appreciated!

#Gcse circle question