Radius of a Circle: Solving Negative Equations

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SUMMARY

The discussion focuses on solving negative equations related to the radius of a circle, specifically addressing the confusion around the negative signs in the equations h-2k+2 and 2h-k-17. The center of the circle is determined to lie between two tangents, necessitating that the constant C in the tangent equation be positive to accurately calculate the perpendicular distances. This clarification is essential for understanding the geometric implications of the equations involved.

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  • Understanding of circle equations in coordinate geometry
  • Familiarity with tangent lines and their properties
  • Knowledge of solving quadratic equations
  • Basic algebraic manipulation skills
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  • Learn about the derivation of the standard form of a circle's equation
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Homework Statement



circle.jpg


Homework Equations



Why is there negative on h-2k+2?and a denominator of negative square root of 5?
also in 2h-k-17, it has a negative sign but the denominator is not negative square root of 5? I really don't understand this part... please explain :frown:
part1.jpg


The Attempt at a Solution

 
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In this problem center of the circle lies between the two tangents. In such cases, to find the perpendicular distances, you have to make the constant C in the tangent positive.
 

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