1) What is the area of a square whose side is 18 cm?

2) What is the diagonal of a square plate whose side is 28 cm?

3) What is the side of a square whose area is 625 mm²?

4) What is the perimeter of a rectangle whose length and breadth are 20 cm and 18 cm?

5) What is the area of a rectangle, whose length and breadth are 10cm and 8cm respectively?