Figuratively square inch is a square whose side length is 1 cm Triangles, rectangles, rhombuses and other geometric shapes may include more than one such square. Thus, square centimeter, in essence, is one of the most commonly used units of area measurement figures in the school curriculum.
Area of various plane geometric figures calculated in different ways:

S = a2 is the area of a square, where a is the length of any of its sides;

S = a*b - the area of a rectangle, where a and b are the sides of this figure;

S = (a*b*sinα)/2 area of a triangle, a and b are the sides of this triangle,α is the angle between the given sides. Actually, the formulas for calculating the area of the triangle is very much;

S = ((a + b)*h)/2 area of trapezoid a and b are the bases of the trapezoid and h is its height. Formulas for calculating area of a trapezoid there are also several;

S = a*h area of a parallelogram, and the side of the parallelogram, h - held to the side elevation.
The above formula is by which it is possible to calculate areas of various geometrical figures.
In order to make it clearer how to find square centimeters, to give a few examples:

Example 1: Given a square whose side length is 14 cm, calculate its area.

To solve the problem you can use one of the above formulas:

S = 142 = 196 cm2

Answer: the area of a square is 196 cm2

Example 2: A rectangle whose length is 20 cm and width 15 cm, is again required to find its area. To solve the problem you can use the second formula:

S = 20*15 = 300 cm2

Answer: the area of a rectangle is 300 cm 2
If the task units of the parties and other parts of the figure are centimeters, and, for example, meters, or decimeters, then to Express the area of this shape in inches again very easily.

Example 3: given trapezoid, the base of which is 14 m and 16 m, its height is 11 m. you want to calculate the area of the shape. This will use the final formula:

S = ((14+16)*11)/2 = 165 m2 = 16500 cm2 (1 m = 100 cm)

Response: the area of a trapezoid 16500 cm2