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•  » MidPoint of the line passing through the circle

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## Topic review (newest first)

krassi_holmz
2006-05-14 05:48:04

I don't know where the mistake is, but there obviously is a mistake.

For Ricky: I left the points unjustified to see who will notice this and post some note.
Now I see you're a good moderator.

Zmurf
2006-05-13 10:37:38

Yes, I know that way, I wanna know why it won't work when I use perpundicular distance.

Ricky
2006-05-13 02:14:18

Looks great, except I would find a way to left (or right) justify the points so the numbers don't go through the lines.

krassi_holmz
2006-05-13 01:43:26

How's that graphic?
I'm starting to make good Mathematica graphics:)

krassi_holmz
2006-05-13 01:41:35

I think yes. Now the question is to find A and B:

Ricky
2006-05-13 00:48:42

Do you mean x² + y² = 8?  Otherwise, it isn't a circle.

Assuming that you do, the question is to find the mid point of AB, correct?

Assuming that as well, what I would do is just find A, then find B, then find the midpoint between the two by:

No?

Zmurf
2006-05-12 16:53:41

Ok we got this question in maths.

Find the midpoint M, of the line passing through points A and B of circle:

if the line has equation:

Noone could get it, well I could of but I didn't want to use the conventional method, I wanted to use a method noone else would think of because that the kinda of guy I am. Plus the teacher didn't give us enougth time before she excited and confidently told us how to do it.

The way she told us how to do it was with some simultaneous stuff, I wasn't listening I was working on my method.

I found that the midpoint of an interval under the circumstances above is the point in which the perpundicular line to the interval specifed passes through the center of the circle.

So by finding the perpundicular distance I found the hypotinuse of the triangle whos base and height will give the coordinates of M in relation to C if C is the center of the circle.

Now this is all works in theory. But I couldn't get it to work on my page. I knew one of the angles of the triangle because I knew the gradient of the line. Using atan(-1/m) of the line given. Using Sin Cos Tan (I refuse to use the childish word SOHCAHTOA) I can calculate the coordinates of M. But when I did so, I recieved irrational answer. But the answers my teacher found were very rational.

Heres my working out: (Or should i say not-working out, hahaha ... bad joke )

It's obviously very wrong. Can someone help me out?