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# Maths watch

1. The length of a rectangle is three times its width.
The perimeter of the rectangle is 96cm.
Label the diagram with the correct length and width for the rectangle ?
3. (Original post by lara36)
The length of a rectangle is three times its width.
The perimeter of the rectangle is 96cm.
Label the diagram with the correct length and width for the rectangle ?
There are 2 x length and 2 x width in the perimeter

Let the width be x, so the length = 3x

Form an equation in terms of x and solve it to find the width. You can then use this to find the length.

Spoiler:
Show

2*x + 2*3x = 2x + 6x = 8x

8x = 96

x = 96/8 = 12cm

Width = 12cm, so length = 3 x 12 = 36cm

4. (Original post by lara36)
I'll get you started:

We can deduce that the ratio width:length is 1:3.

So let the width be x. The length would therefore be 3x, due to the ratio.

What you can do now is calculate the perimeter in terms of x. Then equate this to the actual perimeter (96cm), and solve.

Finally, substitute your found value of x into the expressions we made for the length and width of the rectangle. You can do it!
5. Thank you
6. Could you also help with another ?
8. (Original post by lara36)
Could you also help with another ?
Ok
9. (Original post by lara36)
Could you also help with another ?
Sure, as many as u want! I'm online for a while right now.
10. (Original post by lara36)
Imagine pushing the inverted long edge up, and the inverted short edge to the right. You will get a complete rectangle, then it'll be easy!
11. (Original post by lara36)
You can see that the lines parallel to the 16cm side add up to 16 cm and the lines parallel to the 11cm side add up to 11cm. So the perimeter is 2x(11+16)=54
12. (Original post by hanguyen174)
You can see that the lines parallel to the 16cm side add up to 16 cm and the lines parallel to the 11cm side add up to 11cm. So the perimeter is 2x(11+16)=54
You're not allowed to give the answer straight away mate, give hints first
13. (Original post by lara36)
Here's a handy diagram...
Attached Images

14. (Original post by Mehru1214)
You're not allowed to give the answer straight away mate, give hints first
Oh, sorry! Quite new around here, haven’t helped anyone out yet
15. (Original post by hanguyen174)
Oh, sorry! Quite new around here, haven’t helped anyone out yet
S'ok!
16. Thank you very much i now understand.
17. (Original post by lara36)
Thank you very much i now understand.
No problem
18. can you help im useless at this stuff
19. All your useful tips helped and ive figured it for myself but thank you anyway
20. (Original post by lara36)
All your useful tips helped and ive figured it for myself but thank you anyway
Well done!

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Updated: February 27, 2018
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