drawing and measurement of a rectangle and square are shown in attached file.

what is the perimeter of the design? Please help.

Printable View

- Sep 27th 2010, 11:28 PMalanpaulPerimeter of the design
drawing and measurement of a rectangle and square are shown in attached file.

what is the perimeter of the design? Please help. - Sep 28th 2010, 12:09 AMRHandford
Hi

Well I make it 2(11+6*2+5)+6+6cm

Can you see where the numbers come from? - Sep 28th 2010, 07:00 AMWilmer
Hmmm...I make it 2(11 + 6 + 5 + 12) = 68

(But I've only had one coffee so far...) - Sep 28th 2010, 10:56 PMalanpaul
Please can you explain how do u arrive the figure 68 . Why did apply the formula 2(11+6*2+5)+6+6cm

If you can expalin the mathod it would be very appreciate. - Sep 28th 2010, 11:28 PMRHandford
Attachment 19117

So

2(11+6*2+5)+6+6 cm = 2(A+B*2+D)+C+C cm (Please see attached edited diagram)

2(A+B*2+D) - This part deals with the rectangles at the top and bottom. It is multiplied by two as they are the same.

+C+C cm - This part deals with the square in the middle.

As the image is equal round the center axis you could change it to:

2(11+6*2+11) cm which should give you the same answer, but as I have not had my coffee yet I would not guarantee it! (Happy) - Sep 28th 2010, 11:46 PMRHandford
Hi

I have just noticed you dont really need to do all the above.

As the shape in the middle is a square you just need:

4(11+6) or 4(A+B)

because the square in the middle gets canceled out.

Hope this helps (Clapping)