The measure of central angle ABC is pi/2 radians. What is the area of the shaded sector?

Equation: or

Solution:

Step-by-step explanation:

The formula that is used to calculate the perimeter of  a square is:

Where "s" is the side lenght the square.

Knowing that Xin used  20 yards of fencing to build the walls of a square chicken coop (in which the lenght in yards of each wall is represented with "x"), you can identify that:

Then, you can susbtitute values into the formula :

Finally, you must solve for "x" in order to find its value.

This is: