A rectangular section, the perimeter of which is 42 m, was divided into two equal

A rectangular section, the perimeter of which is 42 m, was divided into two equal parts in the shape of a square. find the area and perimeter of each part.

Given:
P = 42.
To find:
R-?
S-?
Decision:
42 = 2 * 3 * 7;
P = 2 (a + b);
P = 2 (a + 2a);
P = 2 * 3a;
P = 6a;
42 = 6a;
a = 7.
p = 4a;
p = 4 * 7;
p = 28 m (perimeter of the square).
S = a ^ 2.
S = 7 * 7;
S = 49 m ^ 2.
Answer: p = 28 m; S = 49 m ^ 2.

The number 42 needs to be decomposed into prime factors and calculate one of the sides of the rectangle.