5
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).
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. :)
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!
5
20 cm !
The area of square is : 400.0
Each side = 20/4 = 5 cm Area = 5*5 = 25 square cm
The area is already shown as 20 cm2 . A rectangle with sides of 4 cm and 5 cm will have an area of 20 cm2 and a perimeter of 18 cm.
20 cm/5 = 4 cm
Assuming by "equal" you mean that each side is 5 cm, then the perimeter of a square is 5 cm * 4 (sides) = 5 cm + 5 cm + 5 cm + 5 cm = 20 cm The perimeter of any polygon is the sum of the sides Alternatively if by "equal" you mean the sides sum to 5 cm, then the perimeter is 5 cm. Although this is probably not what you meant =)
5
You can't tell the area from knowing the perimeter. There are an infinite number of different rectangles, all with the same perimeter, that all have different areas. Here are a few rectangles that all have perimeters of 42. The last number after each one is its area: 1 cm by 20 cm . . . . . 20 square centimeters 2 x 19 . . . . . 38 3 x 18 . . . . . 54 4 x 17 . . . . . 68 5 x 16 . . . . . 80 10 x 11 . . . 110
Since it is a square, all four sides are the same. The side is sqrt(25 cm2) = 5 cm. The perimeter is 4 x 5 cm = 20 cm.
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).
Providing that they are whole numbers: 1*11 , 2*10, 3*9, 4*8, 5*7, 6*6 and 7*5 cm