Area of a square is its side length squared...
A=s^2 solving for s...
s=√A
The perimeter of a square is 4 times its side length...
P=4s, and since s=√A
P=4√A, and we are told that A=100 in^2 so
P=4√100
P=4*10
P=40 in

is the same as

. The 4s will cancel leaving you with

or

, your 3rd option.
Answer:
YOU not smartYOU DONT KNOW THIS HA HA NOT HELPING YOU BOT.
Step-by-step explanation: