SOLUTION: If a line is perpendicular to a radius of a circle at its endpoint that is on the circle, then the line is tangent to the circle.

Algebra ->  Circles -> SOLUTION: If a line is perpendicular to a radius of a circle at its endpoint that is on the circle, then the line is tangent to the circle.       Log On


   

Question 1174272: If a line is perpendicular to a radius of a circle at its endpoint that is on the circle, then the line is tangent to the circle.
Answer by ikleyn(52887) About Me  (Show Source):
You can put this solution on YOUR website!
.

See the lesson
    - A tangent line to a circle is perpendicular to the radius drawn to the tangent point,
in this site,  and find the proof there  (Theorem 2).