A perimeter is the boundary or outer edge of a shape or an area of land. For instance, a box measuring 5 feet by 2 feet will have a perimeter of (5 x 2) x 2 = 20 feet
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The perimeter of something is just the length around it, so any unit of length could be used. For example, millimetres, centimetres, metres, kilometres, inches, feet, yards, rods, chains, furlongs, miles...!
The perimeter of a rectangle cannot be determined with the area alone as the lengths could vary. For example, the perimeter of the rectangle could be 12 (1 and 5) or 9 (2 and 2.5). For both cases, the area is still 5cm2, but the length can still change to result in different results.
A triangle has side lengths of 3, 4, and 5. The perimeter is 12 total. Perimeter is the total length of the outside of the object.
The area doesn't tell you the dimensions or the perimeter. It doesn't even tell you the shape. -- Your area of 36 cm2 could be a circle with a diameter of 6.77 . (Perimeter = 21.27.) -- It could be a square with sides of 6 . (Perimeter = 24.) -- It could be rectangles that measure 1 by 36 (Perimeter = 74) 2 by 18 (Perimeter = 40) 3 by 12 (Perimeter = 30) 4 by 9 (Perimeter = 26). There are an infinite number of more rectangles that it could be, all with the same area but different perimeters.