Help pleaseeeee!
Moderators: Section Moderators, Forum Moderators
-
- Posts: 16
- Joined: Sun Mar 17, 2019 9:29 pm
Help pleaseeeee!
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
A=£1.10 B=£5 C=£7.70 D=£9.90 E=£17.60
Thanks
Re: Help pleaseeeee!!!!!
The wide area is 4x4x3.14-3x3x3.14=7x3.14fluffygirl_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 cost is 7x3.14x0.35
Because 3.14x0.35 around 1 so answer is C. Don’t need to do calculation.
Regard
Re: Help pleaseeeee!!!!!
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?
-
- Posts: 16
- Joined: Sun Mar 17, 2019 9:29 pm
Re: Help pleaseeeee!!!!!
Thank you .Qeb2019 wrote:The wide area is 4x4x3.14-3x3x3.14=7x3.14fluffygirl_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 cost is 7x3.14x0.35
Because 3.14x0.35 around 1 so answer is C. Don’t need to do calculation.
Regard
-
- Posts: 16
- Joined: Sun Mar 17, 2019 9:29 pm
Re: Help pleaseeeee!!!!!
I am not sure but thank yourusset 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?
Re: Help pleaseeeee!!!!!
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".