Co-ordinate Geometry: Circle Problem

  • Context: Undergrad 
  • Thread starter Thread starter ad_bose
  • Start date Start date
  • Tags Tags
    Geometry
Click For Summary

Discussion Overview

The discussion revolves around a coordinate geometry problem involving a circle defined by its center and radius. Participants explore how to determine the coordinates of a point on the circle from both the circle's center perspective and the origin perspective, with a focus on mathematical reasoning and programming application.

Discussion Character

  • Exploratory
  • Mathematical reasoning
  • Homework-related

Main Points Raised

  • One participant poses a question about finding the coordinates of a point on a circle given its center (h, k) and radius R, using an angle theta.
  • Another participant suggests using vector addition to approach the problem, indicating a vector from the origin to the center and a vector for the point on the circle.
  • A participant clarifies the parameters of the problem, emphasizing the need to calculate the x-distance and y-distance of the point from the origin.
  • One participant proposes that to find the coordinates from the origin, one should add h to the x-coordinate and k to the y-coordinate of the point derived from the center perspective.
  • A later reply indicates that a bug in an associated astrology program has been resolved, implying a connection to the programming context of the discussion.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus on the method for calculating the coordinates from the origin, as different approaches are suggested without agreement on a definitive solution.

Contextual Notes

The discussion includes assumptions about the fixed position of the origin and the definitions of the parameters involved. There may be unresolved mathematical steps related to the vector addition approach.

Who May Find This Useful

Individuals interested in coordinate geometry, mathematical programming, or those working on similar problems in computer graphics or game development may find this discussion relevant.

ad_bose
Messages
5
Reaction score
0
Co-ordinate Geometry (Circle problem)

I've a small Query.
Suppose a circle is plotted with its center at distance h,k (from x=0, y=0) with radius R. If theta is an angle from h,k to any point over the circle, we know that the co-ordinate of that point, from (h,k) perspective, will be Rcos(theta),Rsin(theta). In such a case, what shall be the co-ordinate of the SAME POINT, if it is taken from x,y.
circle.bmp.gif
 
Last edited:
Physics news on Phys.org
Welcome to PF ad_bose.

May I suggest vector addition?
Let c be the vector from the origin to the center of the circle, and p the point on the circle with respect to the center. Then the vector P of the point on the circle with respect to the origin is ... ?
 
Thanks for your suggestion. My query is simple.

The given parameters are :
1. R = Radius of the circle
2. h,k = the co-ordinates with respect to Origin (x,y = 0,0)
3. \theta - The angle from h,k along the x-axis to the mentioned point
If the origin is fixed at x,y and is 0,0; what will be the x-distance and the y-distance of the point from Origin.

I am actually preparing a computer program, in Embarcadero Delphi.
The code is given in attachment. Any help is highly appreciated. I need to actually place an object over the circle from 0,0. Kindly see the code.
 

Attachments

As I said (or was trying to say), try adding h to the x-coordinate and k to the y-coordinate.
 
Thanks pal, the Astrology program bug is solved.
 

Similar threads

  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 7 ·
Replies
7
Views
6K
Replies
2
Views
2K
  • · Replies 14 ·
Replies
14
Views
3K
  • · Replies 4 ·
Replies
4
Views
3K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 14 ·
Replies
14
Views
2K
  • · Replies 21 ·
Replies
21
Views
4K