Use the first answer if you were asked to answer with π and use the second one if you were asked to use 3.14 if your teacher didn't specify use the first one.
To find the area of a circle you use π r² or π multiplied by the radius squared the diameter (which is what we are given) in this case is 16" so you would divide it by two giving you 8 then square 8 giving you 64 and then do π64 or π(8²). A way my teacher helped us learn these equations is with a really cool song, its called The Circle Song look it up online, I hope it helps!
