First you decide on the figure. Then you do your calculations accordingly. For example:
* For a circle, divide the perimeter (which in this case is actually called a circumference) by pi. Then draw a circle with that radius.
* For a triangle, choose three numbers that add up to 13 cm. For instance, if you want an equilateral triangle, divide 13 by 3, to get the length of each side. Note: You can't just choose any side length; no side may be as long, or longer, than the sum of the other sides. For instance, 2 cm, 2 cm, 9 cm won't work. (Each side must individually be shorter than 1/2 of 13 cm).
* Similarly for a quadrilateral, pentagon, etc.
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52 cm
A rectangle with sides of 3 and 4 units will meet the requirements.
perimeter is when you have a shape and then you have your area and that is what is in the middle of the shape and perimeter is the edge of the shape.
It depends on the font - the exact shape of the letter. If you can draw the letter on graph paper, that might help.
13cm*13cm =169 square cm.