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Tuesday, August 22 2017 @ 02:09 AM CDT
 Forum Index >  Test Paper Related >  Primary 4 Matters
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By: achieve_goal (offline)  Monday, September 19 2011 @ 05:24 AM CDT (Read 867 times)  
achieve_goal

Hi again math solvers! Just like to ask you one math question.


The figure below is made up of two identical rectangles

and a square. Find the perimeter of the figure.


Please note that the diagram is an attachment named 'attachment.jpg'.

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By: pkrdd (offline)  Wednesday, September 21 2011 @ 03:05 AM CDT  
pkrdd

perimeter of each rectangle = 40 (15+5+15+5)

but the side of square is joined and thus cannot be counted.
so effective perimeter = 40 - 6 = 34

similarly perimete of square = 6 *4 = 24
but 2 sides of square are joined to rectangle and thus cannot be counted.
so effective perimeter = 6 *2 = 12

Total perimeter of figure = 34 *2 + 6*2 = 80

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