Skelly4444
Junior Member
- Joined
- Apr 4, 2019
- Messages
- 63
We have 2 circles C1 and C2 and need to find the coordinates of intersection.
C1 has its centre at (-2 , 5) and radius 7cm
C2 has its centre at (12 , 5 and radius 16cm
Drawing this out yields the approximate coordinates of (-2.39 , -2) and (-2.39 , 12)
However when I solve the equations algebraically, I can get the x coordinate of -2.39 easily but when I plug it back into one of the circle equation to solve for y, I end up with y values of 11.99 and -0.29. The first one is obviously correct but I cannot seem to obtain the other y value no matter what I do. The quadratic formula is kicking out a spurious value that isn't right?
How can I obtain the other value without drawing it to scale on a piece of paper?
C1 has its centre at (-2 , 5) and radius 7cm
C2 has its centre at (12 , 5 and radius 16cm
Drawing this out yields the approximate coordinates of (-2.39 , -2) and (-2.39 , 12)
However when I solve the equations algebraically, I can get the x coordinate of -2.39 easily but when I plug it back into one of the circle equation to solve for y, I end up with y values of 11.99 and -0.29. The first one is obviously correct but I cannot seem to obtain the other y value no matter what I do. The quadratic formula is kicking out a spurious value that isn't right?
How can I obtain the other value without drawing it to scale on a piece of paper?