Geometry circle equation

[rachelmaddie]

I need help with this question #17
Would I use the equation of a circle
(x – h)^2 + (y – k)^2 = r^2,
(h,k) is the center, r is the radius
(h,k) = (0,0)
radius = diameter/2
radius = 600/2
r = 300 ft

 

[lev888]

Is there a reason you think it would not be appropriate?

 

[rachelmaddie]

Is there a reason you think it would not be appropriate?

No, I was having trouble with the question

 

[lev888]

No, I was having trouble with the question

Which part?

 

[rachelmaddie]

Which part?

I’m not sure if I wrote the equation correctly in standard form and if the origins are correct.

 

[lev888]

I’m not sure if I wrote the equation correctly in standard form and if the origins are correct.

(x – h)^2 + (y – k)^2 = r^2 is written correctly.
Origins are correct.

 

[rachelmaddie]

Substitute
(x - 0)^2 + (y - 0)^2 = 300^2
(x)^2 + (y)^2 = 90, 000

 

[Cilva7]

Your educated guess is correct. The center is at the origin, therefore it's x^2 +y^2=300^2. Rachelmaddie, is just trying to give you a hard time, but I understand, you wanted to make sure.

 

[rachelmaddie]

Your educated guess is correct. The center is at the origin, therefore it's x^2 +y^2=300^2. Rachelmaddie, is just trying to give you a hard time, but I understand, you wanted to make sure.

I thought I’m suppose to simplify the root?

 

[Cilva7]

Oops, I meant to say that Lev888 is just trying to give you a hard time. Yes you should simplify the 300^2.

 

[tkhunny]

Educated guesses are not appropriate, whether you happen to get it right or not.

What parts did you do wrong deliberately?
What parts are you unable to reproduce?
What parts still do not follow a logical line of reasoning?

Lev88 is not giving you a hard time. Lev88 is trying to encourage self-confidence.

We all understand that you just want to be sure. Well, BE sure! The only problem I see with your calculations and formulas is that you do not believe. Well, answer my 3 questions. You should start to believe. About what are you not sure? Put down your vague doubts with exacting setup and calculations and reasoning. If you still have doubts, after your perfect execution, tell such doubts to go away and bother none other.

300^2 is not simpler than 90,000. It is also not less simple. There are no established criteria to determine if one thing is simpler than another. They are EXACTLY the same, as far as I am concerned. If your teacher or examiner requires the tedious multiplication, then do it. This consideration is no longer mathematics; it is pedantic semantics only.