Problem: The length of a tangent, drawn from a point A to a circle, is of the radius . The (shortest) distance from to the circle is:
Answer Choices:
A.
B.
C.
D.
E. a value between r and l
Solution:
The point , the point of tangency, and the center of the circle, determine a right triangle with one side , another side , and the hypotenuse , where is the shortest distance from to the circle.