anonymous
  • anonymous
Medal+Fan
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
Ryuga
  • Ryuga
1.c 2.b 3.d 4.a
anonymous
  • anonymous

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anonymous
  • anonymous
@Ryuga
anonymous
  • anonymous
anonymous
  • anonymous
mathmale
  • mathmale
Cam: You've posted several problems here. Which one do you want to solve NOW?
anonymous
  • anonymous
the very last one
anonymous
  • anonymous
mathmale
  • mathmale
OK. Please type in the formula for the AREA of a circule whose radius is r.
anonymous
  • anonymous
a=π times R^2
mathmale
  • mathmale
By that I meant "the general formula." Yes, you're right. If A is the area of the circle, and r is the radius, then the relationship between A and r is given by \[A=\pi r^2\]
mathmale
  • mathmale
OKI. Now go back to the statement of the problem you've most recently posted. Does that statement give you the area of the given circle? if so, what is it?
anonymous
  • anonymous
314 2/7 cm^2
mathmale
  • mathmale
Right. Now, look again at \[A=\pi r^2\]
mathmale
  • mathmale
Replace A with 314 2/7 cm^2.
anonymous
  • anonymous
314 2/7=22/7 times r^2
mathmale
  • mathmale
Write out the whole equation, please. Why "times?"
anonymous
  • anonymous
because there is no multiplication button
mathmale
  • mathmale
Use * to denote multiplication.
mathmale
  • mathmale
\[A=\pi r^2\]
mathmale
  • mathmale
Let's try this problem solution a different way. The above equation has two variables, A and r. You have the value of one of them. Which one? And what is that value?
anonymous
  • anonymous
with have the value for A and π because my teacher keeps telling me that pie equals 22/7
mathmale
  • mathmale
Cam, you can use 22/7 as an APPROXIMATION pi. But that's not what I asked you. I've given y ou the equation \[A=\pi r^2\]
mathmale
  • mathmale
and told you that there are 2 variables in this equation, A and r. For which one do y ou have a value, and what is that value?
anonymous
  • anonymous
A and the value is 314 2/7
mathmale
  • mathmale
Yes. that is approximately equal to 314.28.
mathmale
  • mathmale
I'd like for you to write the GENERAL formula for the area of a circle, below:
mathmale
  • mathmale
No numbers!
anonymous
  • anonymous
A=πr squared
anonymous
  • anonymous
i had to put the word squared because i can't put numbers
mathmale
  • mathmale
All right. That is the correct formula for the area of a circle. NOW, CAM, you are told that the area is 314 2/7. Please type in the same formula, BUT replace A with 314 2/7.
anonymous
  • anonymous
314 2/7=πr squared
mathmale
  • mathmale
Right. Now, Cam, your job is to solve that equation for the radius, r. How would you do that?
anonymous
  • anonymous
you have to insert what pi is
anonymous
  • anonymous
then solve
mathmale
  • mathmale
You have 314 2/7 = pi * r ^2
mathmale
  • mathmale
the first step is to isolate (solve for) r^2 (which means "r squared"). Leave pi alone; we will worry about its numerical value later. Solve the above equation for r^2, please. Leave pi as the symbol,
mathmale
  • mathmale
|dw:1449857600594:dw|
mathmale
  • mathmale
Hint: Divide both sides of the equation by pi.
mathmale
  • mathmale
|dw:1449857643435:dw|
mathmale
  • mathmale
Cam: haven't heard from you for ten minutes or so. Still interested in solving this problem? I need to see some "signs of life" at your end.
anonymous
  • anonymous
Thanks for your help i will ask my teacher. I will give you a medal and fan
anonymous
  • anonymous
oh i forgot i already fanned u
mathmale
  • mathmale
thank you, Cam, but I'm entirely confident that you and I could solve this problem together. Why do you need to (or prefer to) see your teacher instead?

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