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# AQA areas in Polar Graphs watch

1. I'm doing question 4 in the paper below. I've managed to get up to cii) and have done the integration but I didn't know which limits to use. I was going to do -pi to pi and then halve it but looking at the answer I'm supposed to use the values found in ci). I have no idea why. Could someone please explain, please.

http://filestore.aqa.org.uk/subjects...W-QP-JUN07.PDF

http://filestore.aqa.org.uk/subjects...W-MS-JUN07.PDF
2. (Original post by maggiehodgson)
I'm doing question 4 in the paper below. I've managed to get up to cii) and have done the integration but I didn't know which limits to use. I was going to do -pi to pi and then halve it but looking at the answer I'm supposed to use the values found in ci). I have no idea why. Could someone please explain, please.

http://filestore.aqa.org.uk/subjects...W-QP-JUN07.PDF

http://filestore.aqa.org.uk/subjects...W-MS-JUN07.PDF
As r approaches 0 what's theta doing?

In practice you're just going to use the fact that the values of theta for which r=0 give you the tangents to the curve at the origin.
3. (Original post by BuryMathsTutor)
As r approaches 0 what's theta doing?

In practice you're just going to use the fact that the values of theta for which r=0 give you the tangents to the curve at the origin.
Oh, I see. Thanks.

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