2*(5 + 20) cm = 2*25 cm = 50 cm.
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The area of square is : 400.0
Of course. A rectangle that is 5 by 5 (yes, that's a square, but a square is a rectangle) has a perimeter of 5 + 5 + 5 + 5 = 20 and an area of 5 x 5 = 25. A rectangle that is 9 by 1 also has a perimeter of 20 (= 9 + 1 + 9 + 1) but an area of 9 (= 9 x 1).
It is not. The perimeter of a 1 cm square is 4 cm. The perimeter of a 5 km * 15 km rectangle is 4000000 cm: a million times as large!
No picture is required because a square has four equal sides, so each side is 5 cm long. Perimeter is the measure around the outside of the figure, so you simply add 5+5+5+5 or multiply 5x4 to get 20 cm. Easy peasy. :)