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Area of ellipse???
http://www.aqa.org.uk/qual/gcse/qp-ms/AQA-3301H1-W-QP-Jun04.pdf
In the answers, for question 4 it says the correct formula to work out the area of an ellipse is formula 2. (pi x a x b).
How can this be correct?? Wouldn't a x b be greater the area of the ellipse
?
In the answers, for question 4 it says the correct formula to work out the area of an ellipse is formula 2. (pi x a x b).
How can this be correct?? Wouldn't a x b be greater the area of the ellipse
?
sarahs
http://www.aqa.org.uk/qual/gcse/qp-ms/AQA-3301H1-W-QP-Jun04.pdf
In the answers, for question 4 it says the correct formula to work out the area of an ellipse is formula 2. (pi x a x b).
How can this be correct?? Wouldn't a x b be greater the area of the ellipse?
In the answers, for question 4 it says the correct formula to work out the area of an ellipse is formula 2. (pi x a x b).
How can this be correct?? Wouldn't a x b be greater the area of the ellipse
?You are correct the area is for an ellipse is pi x a x b and for a circle this would be pi x r x r
I read the 2 in your post to mean 2 x pi x a x b which is the wrong answer. I thought you were challenging this formula .....
sarahs
On the diagram a and b are definately full width an height of the diagram. it even describes it as 'width a cm and height b cm'.
Yes, Sarah you are correct. For the diagram the area would be pi x a/2 x b/2 So there is no correct option for you to choose.
A misprint. Normally the a and b represent the two radii.
sarahs
Just out of interest, what would happen in an exam if this happened (poor people who had this exam last summer!!!)? Woould the marks just not be counted??
It would have driven me mad and I would have thought about it all thew way through the rest of the exam!!!
It would have driven me mad and I would have thought about it all thew way through the rest of the exam!!!
I would write down that i thought the options did not include the correct answer ... I would also point out the error to the invigilator. In fact, in this case, there may have been a correction in the invigilators instruction pack.
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