The width of the rectangle is 36 cm and the perimeter is 21 dm 2 cm. Write down the formulas

The width of the rectangle is 36 cm and the perimeter is 21 dm 2 cm. Write down the formulas and the knot to which the length and area of the rectangle are equal.

We solve similarly to the first problem.
P = 2 * (a + b).
P = 21 dm 2 cm = 21 * 10 + 2 = 212 (cm).
212 = 2 * (a + 36)
106 = a + 36
a = 70 (cm) – length.
Find the area:
S = a * b = 70 * 36 = 2520 (cm²).
Answer: length 70 cm, area 2520 cm².