Question

Need help with this math problem, started asking me stuff about PI i've never taught it yet

Answer 1

Answer:

Step-by-step explanation:

your answer would be C and just to clarify i did not look at the other one timll after to make sure i was riget and its hard for me to explaine so i couldnt show yoou so sorry

Answer 2

$\pi (2r)^2 =\boxed{\bf{ 4\pi r^2}}$

That's because 
$(2r)^2 = 2r \times 2r = 4r^2$

Your answer is C.