19 x 4 = 76cm
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Perimeter = 2m Area = 0.25m2
Perimeter = 4*12 = 48 inches
To get the perimeter you have to add all the sides in the shape. For example 20+20+20+20 because a square has 4 sides. So the answer for this most be equals to 80ft long.
To get the perimeter of that square add 10ft 4 times(10+10+10+10) because that's the number of sides a square have.
9ft