What is the perimeter of square EFGH, shown?
A. 14.1
B. 28.3
C. 34.5
D. 17.3

Answer:
B. 28.3
Step-by-step explanation:
Because this is a square, you just need to find the length of one side.
Let us pick one side:
Line EF
The coordinates of the two points of Line EF are (0,5) and (5,0)
The distance formula between two points is:
[tex]d=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}[/tex]
So we just fill in the formula and solve:
[tex]d=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}\\\\d=\sqrt{(5-0)^2+(0-5)^2}\\\\d=\sqrt{(5)^2+(-5)^2}\\\\d=\sqrt{25+25}\\\\d=\sqrt{50}\\\\ d=7.07 units[/tex]
Now that we have that, we just multiply it by 4.
7.07 units x 4 = 28.28 units or 28.3 units