Question Detail
Question
Which equation correctly represents a tangent to x² + y² = r² at point (x₁,y₁)?
Correct Answer
Option A is the correct answer.
Detailed Explanation
The equation of a tangent to the circle x² + y² = r² at point (x₁,y₁) is xx₁ + yy₁ = r².
Hint
The notes indicate answer A.