How to find the lateral surface area of a parallelepiped

Is to begin to understand what is the lateral surface of the parallelepiped. It represents the sum of the areas of the four parallelograms, located on each side of this three-dimensional figure. The area of any parallelogram is given by:S = a*h, where a is one side of the parallelogram h is the height spent to this side.
If the parallelogram is a rectangle, its area is:
S = a*b, where a and b are the sides of this rectangle.Thus, the area of the lateral surface of a parallelepiped is:S = s1+s2+s3+s4, where S1, S2, S3 and S4 of the square, respectively, the four parallelograms that compose the lateral surface of the parallelepiped.

In that case, if a direct box, which is known to the base perimeter P, height h, find the area of its lateral surface can be found as:S = P*h.If given a rectangular parallelepiped (all of whose faces - rectangles), which has a known length of the base (a and b), a c - its lateral edge, the lateral surface of the parallelepiped is calculated by the following formula:
S = 2*c*(a+b).

For clarity, we can consider the examples:Example 1. Given a straight parallelepiped with base perimeter 24 cm, height 8 cm Based on these data the area of the lateral surface it will be calculated like this:
S = 24*8 = 192 см2Пример 2. Let a rectangular parallelepiped base side equal to 4 cm and 9 cm, and the length of its side edges 9 see with this data, we can calculate the lateral surface:
S = 2*9*(4+9) = 234 cm2