To calculate the area of a rectangle :-
Measure the length.
Measure the width.
Multiply the length by the width - the product is the area.
EXAMPLE : length = 7 inches, width = 3 inches, Area = 7 x 3 = 21 square inches.
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Area = Length * Breadth.
area of an box is length x width.
You cut the shape down into smaller shapes that you recognise and know how to calculate the area of. Then calculate the area of the small shapes and add the all up.
For the same base dimensions (base area) and the same height, the rectangular prism has more surface area.
This will usually be the case for objects that have different shapes: even if they have the same volume, it is unlikely that they have the same surface area. As an example, calculate the volume and surface area of the following two rectangular block shapes: 1) A 2 x 2 x 2 rectangular block 2) A 1 x 1 x 8 rectangular block