From a rectangular metallic sheet of length 36 cm and breadth 16 cm, three circular plates of radii 6 cm, 4 cm and 2 cm are cut out. If the area of the remaining part of the metallic sheet is equal to the area of a square, then find the length of each side of the square (in cm).
\(\left( {Use\space \pi = \frac{{22}}{7}} \right)\)
1
18.6
2
18
3
19.4
4
20