Question Detail
Question
A fundamental principle of tangency states that a tangent line to a circle is always perpendicular to which element at the point of tangency?
Correct Answer
Option D is the correct answer.
Detailed Explanation
Page 10 explicitly states: 'A tangent is perpendicular to the radius of a circle drawn at the point where the tangent meets the circle.' This is a core definition of tangency.
Hint
Refer to the definitions under 'WHAT IS A TANGENT?' on page 10.