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February 1st, 2014, 12:35 PM  #1 
Newbie Joined: Jan 2014 Posts: 25 Thanks: 0  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 ² 160 cm ² 180 cm ² 200 cm ² n.d.a. 
February 1st, 2014, 02:40 PM  #2 
Senior Member Joined: Aug 2012 Posts: 2,323 Thanks: 715  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? 
February 1st, 2014, 06:52 PM  #3 
Newbie Joined: Feb 2012 Posts: 15 Thanks: 0  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 
February 2nd, 2014, 09:31 AM  #4 
Newbie Joined: Jan 2014 Posts: 25 Thanks: 0  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 att; Itamar 
February 2nd, 2014, 09:34 AM  #5  
Newbie Joined: Jan 2014 Posts: 25 Thanks: 0  Re: A square is 9 cm side and its area corresponds to 45% Quote:
 
February 2nd, 2014, 10:10 AM  #6 
Senior Member Joined: Sep 2007 From: USA Posts: 349 Thanks: 67 Math Focus: Calculus  Re: A square is 9 cm side and its area corresponds to 45%
Happysmiles374 is correct.

February 2nd, 2014, 10:36 AM  #7 
Newbie Joined: Jan 2014 Posts: 25 Thanks: 0  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 
February 2nd, 2014, 10:46 AM  #8 
Senior Member Joined: Sep 2007 From: USA Posts: 349 Thanks: 67 Math Focus: Calculus  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.

February 2nd, 2014, 10:50 AM  #9  
Senior Member Joined: Aug 2012 Posts: 2,323 Thanks: 715  Re: A square is 9 cm side and its area corresponds to 45% Quote:
 
February 2nd, 2014, 11:01 AM  #10 
Newbie Joined: Jan 2014 Posts: 25 Thanks: 0  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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