SOLUTION: if the diameter of a circle is 3meters, what is the perimeter of the smallest square that can fully contain the circle?

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If you envision the square touching the circle at 4 points, with the circle inside the square, you can see that the dimensions of the square will be equal to the diameter of the circle. So, it will 3 meters on each side.
The perimeter will be 4*3 = 12 m.
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Since the perimeter of the square has to be greater than the circumference of the circle, you can check that.
circumference = pi*d
= 3*pi
= 3*3.14, which is < 12.
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Done.