QUOTE(*Life* @ Jun 28 2008, 12:00 PM) [snapback]2948955[/snapback]
16x10=160cm square
16-3=13
10+3=13
k=13
13x13=169cm square
therefore the area increases by 9cm.
increases by 9cm 16 x 10 = 160 13 x13 =169

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