MHB What is the equation of a circle tangent to the x-axis with a center at (3, 5)?

  • Thread starter Thread starter mathdad
  • Start date Start date
  • Tags Tags
    Circle
Click For Summary
The equation of a circle tangent to the x-axis with a center at (3, 5) is derived using the formula (x - h)^2 + (y - k)^2 = r^2. Here, h is 3, k is 5, and the radius r is equal to 5, as the distance from the center to the x-axis is 5. Substituting these values, the equation simplifies to (x - 3)^2 + (y - 5)^2 = 25. The calculations confirm the correctness of the equation. This demonstrates a clear understanding of the geometric properties of circles.
mathdad
Messages
1,280
Reaction score
0
Find the equation of the circle tangent to the x-axis and with center (3, 5).

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

h = 3, k = 5

r = 5

(x - 3)^2 + (y - 5)^2 = 5^2

(x - 3)^2 + (y - 5)^2 = 25

Yes?
 
Mathematics news on Phys.org
Yes, all correct. (Yes)
 
Always good to be right.
 
Thread 'Erroneously  finding discrepancy in transpose rule'
Obviously, there is something elementary I am missing here. To form the transpose of a matrix, one exchanges rows and columns, so the transpose of a scalar, considered as (or isomorphic to) a one-entry matrix, should stay the same, including if the scalar is a complex number. On the other hand, in the isomorphism between the complex plane and the real plane, a complex number a+bi corresponds to a matrix in the real plane; taking the transpose we get which then corresponds to a-bi...

Similar threads

  • · Replies 59 ·
2
Replies
59
Views
3K
  • · Replies 2 ·
Replies
2
Views
3K
  • · Replies 8 ·
Replies
8
Views
1K
Replies
2
Views
2K
  • · Replies 2 ·
Replies
2
Views
1K
  • · Replies 8 ·
Replies
8
Views
2K
  • · Replies 7 ·
Replies
7
Views
3K
  • · Replies 2 ·
Replies
2
Views
1K
  • · Replies 4 ·
Replies
4
Views
1K
Replies
2
Views
2K