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How many square tiles does the tiler need for the border?

How many square tiles does the tiler need for the border?-example-1
User Waj
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to find this you find the perimeter which is 2L + 2W which would be 2(30) + 2(20) which would be 100 then you have to relize that if you put 2 triangles together it makes a square so all together you need 102 squares
User Staad
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