100 cm
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The perimeter is the addition of the all the sides of the shape. For example if a rectangle has two sides which are 4cm and two sides which are 7cm, then the perimeter will be 4cm+4cm+7cm+7cm. The perimeter would therefore be 22cm. The area of a shape is gotten by multiplying the length and breadth of the shape. For example, in a rectangle witrh the same measurements above, the area will be 4cm x 7cm and that would 28cm. You have to use the square sign but I can't do that here.
the perimeter of a square that has a side length of 7 cm is........28cm squared
9cm + 5cm + 9cm + 5cm = 28cm
28cm is about 11 inches
The diameter is 28cm