Square area 10,000 dm2. Find the perimeter of the square and the length of the side of the square.

Given:
Sq = 10000 dm ^ 2
P =?
a =?
Decision:
1) Sq = 10000 dm ^ 2 = 10000/10 ^ 2 m ^ 2 = 100 m ^ 2 // 1 meter contains 10 decimeters, therefore, 1 square meter contains 10 ^ 2 decimeters
2) The area of a rectangle can be found by multiplying the lengths of its two adjacent sides, and all sides of a square are equal. Hence:
Skv = a ^ 2
a = sqrt (S) // root of S
a = sqrt (100) = 10 m
3) The perimeter of a square is found as the sum of the lengths of its sides:
P = a + a + a + a = 4 * a = 4 * 10 = 40 m
Answer: 40 m; 10 m