Answer:
A = π(7x + 3)² cm²
Step-by-step explanation:
A = πr² is the appropriate equation. If r = 7x + 3 cm, then the area of this particular circle is:
A = π(7x + 3)² cm²
Answer:
Step-by-step explanation:

I assume you happen to mean, what is the formula for a circle.
The formula is:
A=
The GCF is what they all have in common.
2x is the only thing they ALL share.