Math Is Fun Forum
  Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

You are not logged in.

#1 2012-09-09 14:16:02

tina123
Member
Registered: 2012-04-29
Posts: 83

divide a rectangle in two block

Consider this problem : http://i1069.photobucket.com/albums/u472/tina12354/exam.png

I  wanna divide a rectangle into two blocks where 1st block should have 30% of  total block . any idea ..

How to do it ?

Offline

#2 2012-09-09 15:48:31

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 86,168

Re: divide a rectangle in two block

Hi;

Maximum percentage of what?


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

Online

#3 2012-09-10 00:20:25

tina123
Member
Registered: 2012-04-29
Posts: 83

Re: divide a rectangle in two block

bobbym wrote:

Hi;

Maximum percentage of what?

sorry .....
I meant to say , 1st block have minimum percentage as compare to 2nd block.
say block  1 have 30% and block2 is 70% .

Offline

#4 2012-09-10 00:39:07

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 86,168

Re: divide a rectangle in two block

Hi tina123;

I have the same question. Percentage of what? Area? Points?


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

Online

#5 2012-09-10 00:40:00

tina123
Member
Registered: 2012-04-29
Posts: 83

Re: divide a rectangle in two block

bobbym wrote:

Hi tina123;

I have the same question. Percentage of what? Area? Points?

area ...
percentage of block1 area ,,

Offline

#6 2012-09-10 00:54:59

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 86,168

Re: divide a rectangle in two block

Hi;

How do you want to split the big rectangle up? With one line or more than one line. Please look at the drawings.

View Image: one.gif View Image: three.gif View Image: two.gif

In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

Online

#7 2012-09-10 01:00:02

tina123
Member
Registered: 2012-04-29
Posts: 83

Re: divide a rectangle in two block

bobbym wrote:

Hi;

How do you want to split the big rectangle up? With one line or more than one line. Please look at the drawings.

like 1st figure. i meant by one line .

Last edited by tina123 (2012-09-10 01:00:40)

Offline

#8 2012-09-10 01:13:14

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 86,168

Re: divide a rectangle in two block

For the 8 x 16 rectangle you have in the picture. This is one answer.

View Image: 2012-09-10_060949.gif

In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

Online

#9 2012-09-10 01:38:10

tina123
Member
Registered: 2012-04-29
Posts: 83

Re: divide a rectangle in two block

bobbym wrote:

For the 8 x 16 rectangle you have in the picture. This is one answer.

hy .. bottom block is small .
second block should be 1st block.

I want 30% area should be for 1st block and the rest 70% area should  be for 2nd block .
you did opposite .


and please let be know how did u do that .
thanks

Last edited by tina123 (2012-09-10 01:41:03)

Offline

#10 2012-09-10 08:07:14

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 86,168

Re: divide a rectangle in two block

Hi;

You want the top block to be the small one?


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

Online

#11 2012-09-10 11:49:51

tina123
Member
Registered: 2012-04-29
Posts: 83

Re: divide a rectangle in two block

bobbym wrote:

Hi;

You want the top block to be the small one?

yes

Offline

#12 2012-09-10 12:36:50

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 86,168

Re: divide a rectangle in two block

Try this one then.

View Image: 2012-09-10_173421.gif

In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

Online

#13 2012-09-10 12:51:57

tina123
Member
Registered: 2012-04-29
Posts: 83

Re: divide a rectangle in two block

bobbym wrote:

Try this one then.

you did not mention that how did u do that .

Offline

#14 2012-09-10 12:56:08

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 86,168

Re: divide a rectangle in two block

Hi;

30% of ( 8 * 16 ) is 38.4. You need a rectanghle with an area of 38.4.

The width is 8 so we can only adjust the length from 0 to 16. We solve that with algebra.

L = 4.8

So the dimensions of the rectangle are 4.8 x 8. See the drawing.


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

Online

#15 2012-09-10 12:58:01

tina123
Member
Registered: 2012-04-29
Posts: 83

Re: divide a rectangle in two block

bobbym wrote:

Hi;

30% of ( 8 * 16 ) is 38.4. You need a rectanghle with an area of 38.4.

The width is 8 so we can only adjust the length from 0 to 16. We solve that with algebra.

L = 4.8

So the dimensions of the rectangle are 4.8 x 8. See the drawing.

k alright thanks

Offline

#16 2012-09-10 12:59:16

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 86,168

Re: divide a rectangle in two block

Hi;

Are you clear on what I did?


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

Online

Board footer

Powered by FluxBB