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!
By what I can tell, that is telling you what the measurement of rain was per month. For example, August had 10. That means that in the month of August there was 10 inches of rain.
