Question 1089307
The constant {{{pi}}} (pronounced pie as in apple pie)
is not exactly 3.14.
It has an infinite number of decimal places.
My computer would display it as 3.14159265358979,
and probably all those digits are correct, but there are more.
The only absolutely correct answers would be
{{{64pi}}} for the area of the circle and {{{16pi}}} for the circumference.
 
Maybe the instructions for your assignment say to write an approximate result, correct to a certain number of decimal places, and your results, based on {{{pi=3.14}}} , are not accurate enough.
If you use a calculator with a symbol for {{{pi}}} ,
your results, rounded to 2 decimal places, would be
201.06 and 50.27.
My computer calculates 201.061929829747 and 50.2265482455.
 
It could also be the computer expects your answer rounded differently,
or that it expects the units in the answers,
or that it expects the answers written as "64pi" and "16pi".
With computerized school work, it is more important 5than ever to follow instructions on how to write the answer,
 
NOTES:
You can write the formulas for circle area and circumference as
pi*r^2 and 2pi*r, and people used to writing formulas into computers would understand.
Asterisk is a symbol for multiplication, and the ^ symbol means that what follows is an exponent or superscript and would be written higher if using pencil and paper.
If this explanation does not help, you can ask me for further explanation by entering a private thank you message to me. Then I could email an answer to the email address you used to register, which will not be given to anyone else.