Part A

How many stones make up the perimeter of the prototype picture frame?Perimeter is usually calculated by adding the length of each side of a shape.In the prototype, there are four stones per side.If we try to find the total number of stones in the frame by adding the number of stones per side, we'll get an incorrect total.Why?

12 stonesThe total number of stones in the frame by adding the number of stones per side gives 16. But 16 doesnt equal 12 and therefore it is incorrect.

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