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February 1st, 2014, 12:35 PM   #1
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A square is 9 cm side and its area corresponds to 45%

Good afternoon staff forum.

A square is 9 cm side and its area corresponds to 45% of the area of a rectangle. Under these conditions, what is the area of the rectangle?

150 cm
160 cm
180 cm
200 cm
n.d.a.
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February 1st, 2014, 02:40 PM   #2
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Re: A square is 9 cm side and its area corresponds to 45%

Step 1: What is the area of the square?

Step 2: That area is 45% of which rectangle?
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February 1st, 2014, 06:52 PM   #3
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Re: A square is 9 cm side and its area corresponds to 45%

Area=lxw
(9cm)^2=81cm^2
81cm^2/0.45=180cm^2
180cm^2 is the area of the rectangle
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February 2nd, 2014, 09:31 AM   #4
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Re: A square is 9 cm side and its area corresponds to 45%

Friend not understand how you reached 180.
9x9 = 81 ta good 2/0.45? would not ---- 90 = 81 = 90 = 171? hum

^ 2/0.45 = 81 cm 180 cm ^ 2

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February 2nd, 2014, 09:34 AM   #5
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Re: A square is 9 cm side and its area corresponds to 45%

Quote:
Originally Posted by itamaratento
Friend not understand how you reached 180.
9x9 = 81 ta good 2/0.45? would not ---- 81 + 90 = 171? hum

^ 2/0.45 = 81 cm 180 cm ^ 2

att;

Itamar
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February 2nd, 2014, 10:10 AM   #6
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Re: A square is 9 cm side and its area corresponds to 45%

Happysmiles374 is correct.
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February 2nd, 2014, 10:36 AM   #7
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Re: A square is 9 cm side and its area corresponds to 45%

good afternoon friend

Can you show me another way to do this account.
more simplified, I am not able to understand the logic ..
Another example has to be able to teach me ... thanks


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February 2nd, 2014, 10:46 AM   #8
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Re: A square is 9 cm side and its area corresponds to 45%

OK. The area of the square is S and the area of the triangle is T. The area of the square is S=9cm * 9cm=81cm^2. It also says .45T=S. So, solve for T. T=S/.45=81/.45=180cm^2.
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February 2nd, 2014, 10:50 AM   #9
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Re: A square is 9 cm side and its area corresponds to 45%

Quote:
Originally Posted by itamaratento
good afternoon friend

Can you show me another way to do this account.
more simplified, I am not able to understand the logic ..
Another example has to be able to teach me ... thanks
What is 45% of 180?
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February 2nd, 2014, 11:01 AM   #10
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Re: A square is 9 cm side and its area corresponds to 45%

hello,


then have to divide 1.8 81/.45 will give it me?



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