SOLUTION: I am in MAT 104. I've never had algebra. I just started circles and I think Im missing a step in the formula. I've tried several problems and they are all wrong. To get the area

Algebra ->  Circles -> SOLUTION: I am in MAT 104. I've never had algebra. I just started circles and I think Im missing a step in the formula. I've tried several problems and they are all wrong. To get the area       Log On


   

Question 1089307: I am in MAT 104. I've never had algebra. I just started circles and I think Im missing a step in the formula. I've tried several problems and they are all wrong. To get the area I am using A=nr(exponent) 2 don't know how to make the 2 in the air. one of the problems is n=3.14 r= 8ft I multiplied 3.14x8 to the second I got the area is 200.96. To get circumfrence I used 2nr formula so I multiplied 2x3.14x8 =50.24. I got it wrong. Am I missing a step? Or leaving a step out?
Found 3 solutions by ikleyn, KMST, MathTherapy:
Answer by ikleyn(52812) About Me  (Show Source):
You can put this solution on YOUR website!
.
1.  Area of the circle of the radius r is  A = pi%2Ar%5E2 = 3.14%2Ar%5E2 = 3.14%2A8%5E2  ft^2.  Can you calculate it on your own ?


2.  Circumference of a circle of the radius r is  S = 2%2Api%2Ar = 2%2A3.14%2Ar = 2%2A3.14%2A8  ft.   Can you calculate it on your own ?




3.  To present r%5E2, write simply r^2.   Find this symbol "^" in your keyboard.  It is where "6" is.


    And NEVER more say "I don't know how  . . . ".  You are just explained.




Answer by KMST(5328) About Me  (Show Source):
You can put this solution on YOUR website!
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.

Answer by MathTherapy(10555) About Me  (Show Source):
You can put this solution on YOUR website!

I am in MAT 104. I've never had algebra. I just started circles and I think Im missing a step in the formula. I've tried several problems and they are all wrong. To get the area I am using A=nr(exponent) 2 don't know how to make the 2 in the air. one of the problems is n=3.14 r= 8ft I multiplied 3.14x8 to the second I got the area is 200.96. To get circumfrence I used 2nr formula so I multiplied 2x3.14x8 =50.24. I got it wrong. Am I missing a step? Or leaving a step out? 
First of all, were you instructed to use matrix%281%2C3%2C+3.14%2C+for%2C+pi%29?

Second, were you asked to give your answer to a certain decimal place?

These could be the differences between you getting the answers correct or incorrect.