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 Post subject: Help pleaseeeee!
PostPosted: Sun Mar 17, 2019 8:44 pm 
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1.The cost of making a yd wide around a circular pond 6yds in diameter at £0.35 per sq yd is ???

A=£1.10 B=£5 C=£7.70 D=£9.90 E=£17.60

Thanks


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 Post subject: Re: Help pleaseeeee!!!!!
PostPosted: Sun Mar 17, 2019 11:12 pm 
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fluffygirl_27 wrote:
1.The cost of making a yd wide around a circular pond 6yds in diameter at £0.35 per sq yd is ???

A=£1.10 B=£5 C=£7.70 D=£9.90 E=£17.60

Thanks


The wide area is 4x4x3.14-3x3x3.14=7x3.14

The cost is 7x3.14x0.35

Because 3.14x0.35 around 1 so answer is C. Don’t need to do calculation.

Regard


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 Post subject: Re: Help pleaseeeee!!!!!
PostPosted: Wed Mar 20, 2019 9:26 am 
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I agree with, Qeb2019, but would draw the pond for a child of 11+ age so they can visualise why you are subtracting one area from another. I did not think they did areas of circles or pi at this age. Is it an old book, as it is using yards?


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 Post subject: Re: Help pleaseeeee!!!!!
PostPosted: Thu Apr 25, 2019 5:25 pm 
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Qeb2019 wrote:
fluffygirl_27 wrote:
1.The cost of making a yd wide around a circular pond 6yds in diameter at £0.35 per sq yd is ???

A=£1.10 B=£5 C=£7.70 D=£9.90 E=£17.60

Thanks


The wide area is 4x4x3.14-3x3x3.14=7x3.14

The cost is 7x3.14x0.35

Because 3.14x0.35 around 1 so answer is C. Don’t need to do calculation.

Regard


Thank you .


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 Post subject: Re: Help pleaseeeee!!!!!
PostPosted: Thu Apr 25, 2019 5:26 pm 
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Joined: Sun Mar 17, 2019 8:29 pm
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russet wrote:
I agree with, Qeb2019, but would draw the pond for a child of 11+ age so they can visualise why you are subtracting one area from another. I did not think they did areas of circles or pi at this age. Is it an old book, as it is using yards?


I am not sure but thank you


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 Post subject: Re: Help pleaseeeee!!!!!
PostPosted: Wed May 08, 2019 7:52 am 
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I know I'm late but I suspect the book is old, or possibly US oriented. Either way I wonder if it is aimed at children at a stage when they are using 22/7 as a "good enough" approximation of pi, in which case the 7's fall out and you end up with 22*.35 so the answer C would be "exact" (based on the initial assumption of pi=22/7), rather than "nearest".


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