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The length of each side of the squares in the above figure is 9 units. Find the area of the region colored red.

 

 May 31, 2020
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Looking at only the red triangle in the top 3 squares:  Area  =  ½·18·18  =  162.

 

Looking at only the triangle in the bottom row of squares:  Area  =  ½·27·9  =  121.5.

 

Adding them together ...

 May 31, 2020

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