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Go Back   REVscene Automotive Forum > Automotive Chat > REVscene Nation: Beyond The GVRD > Island Off-Topic

Island Off-Topic "Must you always talk about cars?" Not in here.
For other things in life..

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Old 01-17-2009, 02:14 PM   #1
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Math help

IS anyone here good at this stuff.

i have 3 questions to due. And was wondering if anyone could give me a hand.

1. A circle has x intercepts at A(1,0) and B(5,0) and its center lies on the line y = 4. Determine the equation of this circle?.

2. Find the points of intersection between the circle (x - 3)2+ (y-1)2 = 5 and the line y = 2x -2

3. Find the shortest distance between the point P(6,5) and the line 3x+4y=24.

any help would be awesome.

thank you.
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Old 01-17-2009, 03:13 PM   #2
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i would say brown
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Old 01-17-2009, 03:43 PM   #3
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Originally Posted by sIN View Post
IS anyone here good at this stuff.

i have 3 questions to due. And was wondering if anyone could give me a hand.

1. A circle has x intercepts at A(1,0) and B(5,0) and its center lies on the line y = 4. Determine the equation of this circle?.

2. Find the points of intersection between the circle (x - 3)2+ (y-1)2 = 5 and the line y = 2x -2

3. Find the shortest distance between the point P(6,5) and the line 3x+4y=24.

any help would be awesome.

thank you.
Grade 12 stuff? I would do it for you if I had some paper in front of me. And it might involve some multi-variable vector calculus. But those questions are easy! C'mon now.
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Old 01-17-2009, 03:47 PM   #4
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really?.. some reason im afraid of taking shits after ghost movies.. i always think about what if a ghost's hand came out of the toilet and grabbed my nuts or stuck its hand in my ass -___________-.... i mean if it came outa the mirror id have reaction time to run but the toilets.. thats a pretty good blind spot to sneak up on people from -_____- ...
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Old 01-17-2009, 07:37 PM   #5
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Grade 12 stuff? I would do it for you if I had some paper in front of me. And it might involve some multi-variable vector calculus. But those questions are easy! C'mon now.
Hey man, some of us had a hard time with Grade 12 Calc. It's not as hard as driving a MKIII Supra though, I hear that's really hard
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Old 01-17-2009, 07:51 PM   #6
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i guess i shoudl probably brush up on that stuff for sept
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Old 01-17-2009, 08:59 PM   #7
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#1.

you know that the coordinate of the middle is (x,4)

(x - h)^2 + (y - k)^2 = r^2

in this equation you know that h and k is the coordinate of the midpoint of the circle..



(x - h)^2 + (y - 4)^2 = r^2

ok and you also know that on the circle exists coordinates (1,0)...and (5,0)
you need to plug in these 2 coordinates into the equation separately and you'll get 2 linear equatoins

(1 - h)^2 + (0 - 4)^2 = r^2
(5 - h)^2 + (0 - 4)^2 = r^2

subract these 2 equations from 1 another...

(1-h)^2 - (5-h)^2 = 0

(1-h)(1-h) - (5-h)(5-h) = 0

1-2h+h - (25-10h+h)=0

1-2h+h-25+10h-h=0

8h-24=0

h= 24/8 = 3

so u know the midpoint is (3,4)

ok so plug in this midpoint again back into your circle equation

(x - 3)^2 + (y - 4)^2 = r^2

and plug in (1,0) into this equation and solve for r.... (you can also plug in (5,0), or any other coordinate that exists on the circle)

(1 - 3)^2 + (0 - 4)^2 = r^2

4+16= r^2

r= sqrt(20)

final answer...
(x - 3)^2 + (y - 4)^2 = 20

Last edited by WingHang; 01-17-2009 at 09:03 PM. Reason: not quite done.
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Old 01-17-2009, 11:35 PM   #8
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thank you
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Old 01-18-2009, 09:49 AM   #9
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You know,

After I graduated from post sec. I have never needed to find the equation of a circle who's center lies on the line y=4 and has intercepts of A(1,0) and B(5,0). It just hasn't come up.
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Old 01-18-2009, 10:23 AM   #10
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You know,

After I graduated from post sec. I have never needed to find the equation of a circle who's center lies on the line y=4 and has intercepts of A(1,0) and B(5,0). It just hasn't come up.
Maybe if you became a rocket surgeon?
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Old 01-18-2009, 11:20 AM   #11
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must be calculating the radius of the cross section of a rocket........
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Old 01-18-2009, 01:16 PM   #12
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Likewise... about the only post secondary math I've ever used is Discrete (binary, logic) and Newton's method.

Now, some of our programmers do lots of "fun" math all the time, but they're not in the department I run.
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Old 01-18-2009, 02:51 PM   #13
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Hey man, some of us had a hard time with Grade 12 Calc. It's not as hard as driving a MKIII Supra though, I hear that's really hard
Deep cut Christian But I guess I totally deserve it. Hahaha.
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Old 01-18-2009, 05:33 PM   #14
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hey thanks for your help. it is greatly appreciated.
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Old 01-18-2009, 06:35 PM   #15
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I use simple trig all the time. But I wouldn't have a clue how to do this. Maybe if I really sat down and looked at it for an hour with paper and a calculator.
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Old 01-18-2009, 07:27 PM   #16
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Old 01-18-2009, 10:49 PM   #17
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mathamacation is the proper word for every thing when it comes to this type of stuff
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Old 01-18-2009, 11:26 PM   #18
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lol couldn't find help in the Vancouver Board, had to come here?
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Old 01-19-2009, 08:32 AM   #19
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lol couldn't find help in the Vancouver Board, had to come here?
Less chance someone here would rat on him for cheating?

As you may be able to tell, I am not a fan of someone posting their school work to get someone else to do it.
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Old 01-19-2009, 06:16 PM   #20
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lol couldn't find help in the Vancouver Board, had to come here?
This thread was started before the one on the Van side.
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