Finding the Intersection of Two Circles: A Challenge

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SUMMARY

The discussion focuses on solving a geometric problem involving two non-intersecting circles, where the goal is to find points on each circle that are a specific distance 'k' apart. Participants emphasize the need to understand the relationship between the circles' radii (r_1 and r_2) and the distance between their centers (R). They clarify that valid distances between the points must fall within the range of R - (r_1 + r_2) to R + (r_1 + r_2). This establishes the mathematical constraints necessary for finding such points.

PREREQUISITES
  • Understanding of Euclidean geometry principles
  • Familiarity with Cartesian coordinates (x and y)
  • Knowledge of circle properties, including radius and center distance
  • Basic algebra for manipulating inequalities
NEXT STEPS
  • Explore the concept of circle intersection in Euclidean geometry
  • Learn about distance formulas in Cartesian coordinates
  • Investigate geometric constraints involving multiple circles
  • Study algebraic methods for solving inequalities
USEFUL FOR

Mathematicians, geometry students, and anyone interested in solving geometric problems involving circles and distances.

mamali
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hi everyone !

we have two circles that doesn't have intersections now we want to find a point on each circle that the distance of this two points are 'k' please help me . . .
 
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welcome to pf!

mamali said:
hi everyone !

we have two circles that doesn't have intersections now we want to find a point on each circle that the distance of this two points are 'k' please help me . . .

hi mamali! welcome to pf! :wink:

Is this an old-fashioned Euclidean geometry question, or are we allowed to use Cartesian (x and y) coordinates?

Either way, you have to do some of the work yourself …

show us what you've tried. :smile:
 
Let the radii of the two circles be [itex]r_1[/itex] and [itex]r_2[/itex] and the distance between the centers be R. Then there cannot be a point on one circle and a point on the other so that the distances between the points is less than [itex]R- (r_1+ r_2)[/itex] nor greater than [itex]R+ (r_1+ r_2)[/itex]. Do you see why? For distances between those numbers, as tiny-tim says, we would have to see how you would approach this problem yourself so we can know what kinds of hints will help.
 

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