Question

Prove that the straight-line drawn perpendicular to a radius of a circle at its extremity is a tangent to the circle. Use Algebra only

Answer 1

@Directrix

Answer 2

We're having an epidemic of coordinate Geometry proofs. :)

@CrashOnce I left a question for you about the Angle Bisector Theorem proof in another thread.

Answer 3

"A tangent to a circle is perpendicular to the radius at the point of tangency. "
Isn't the line is a tangent by definition?

Answer 4

basically it just asks you to prove that a tangent is 90 degrees to a radius

Answer 5

to prove it? don't really know....

Answer 6

@TuringTest

Answer 7

Maybe,