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It depends on the shape of the area you are referring to.

1) For a square with side "a", the area is (a squared) and the perimeter is 4 x a

2) For a rectangle with sides "a" and "b", the area is a x b and the perimeter is

2 x (a + b)

3) For a circle with radius "a", the area is pi x (a squared) and the perimeter (for a circle it is the circumference) is 2 x pi x r

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Q: How do you find the area and perimeter with no numbers just letters?
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