Question

find i if the length of tangent seg from the point (3,-4) to circle x²+y²=k² is √21 units.​

Answer 1

Answer:

The radius has endpoints (–3,4) and the center of the circle (0,0), so its slope is –4/3. The slope of the tangent line must be perpendicular to the slope of the radius, so the slope of the line is ¾.