The America flag in Mrs. Parkers classroom is similar to that American flag on the flag pole in front of the school. Each dimension of the flag outside is 4.2 times the corresponding dimensions of the one in her classroom. Which is true?

We have two different flags
Mrs Parkers
School flag= 4.2(Mrs. Parker)
Let's see with an example
Imagine the dimension of the Mrs Parker are
Mrs Parkers Flag
Length=3
Width=2
P=(2*2)+(2*3)=10
A=2*3=6
School Flag
Length=3*4.2=12.6
Width=2*4.2=8.4
P=(2*12.6)+(2*8.4)=42
A=(8.4*12.6)=105.84
With this information, we can answer what is true
A is true
4.2/10=4.2
P=