SQUARE AND RECTINGCE
The surface area of a square or a rectangle is calculated by the following formula:
Area (square or rectangle) = length x width

In a square the lengths of all four sides are equal and all four angles are right angles.
In a rectangle, the lengths of the opposite sides are equal and all four angles are right angles.
Note that in a square the length and width are equal and that in rectangle the length and width are not equal.

PROBLEM Calculate the surface areas of the square and of the rectangle.

GIVEN: Square: length = 4 cm width=4cm Rectangle: length = 8 cm width= 4cm​