You can find the area of a square by multiplying two sides together. All of the sides of a square are equal. In this case, , so the length of all of the sides of the square is 4 inches.

Add up all of the sides of a triangle to get the perimeter. Here, 2 of the sides add up to give you 9 inches. The third side must equal the difference between 14 inches and 9 inches.

The formula for perimeter of a rectangle is

To solve for the perimeter we can plug our known values into the equation.

The area of a square can be found by multiplying the length of a side by itself. 81 is equal to 9 times 9, therefore the length of one side is 9 centimeters.

To find the perimeter of a trapezoid, add up the lengths of its four sides. In the given trapezoid,

To find the missing side, combine like terms and solve for :

The missing side of the trapezoid is long.

An equilateral triangle means that all of the side lengths are the same. To find the perimeter, we can take the one known side length and multiply by (since there are sides) or we can add the side length to itself times.

To find the perimeter, we add all of the side lengths together.

The formula for finding the area of a square is , or, because this is a square, .

area = centimeters centimeters, or

If one combines the 2 identical triangles, their base and height become the length and width of the rectangle.

Area of a rectangle is:

In this case

The area of a square can be found by multiplying the length of a side times itself. The side length of the above square is 12 cm. By finding 12 x 12, we find that the area of the square is 144 cm. squared.