Multiple choice

The line containing the radius through the point of contact is called the ......... to the circle at the point.

  1. tangent

  2. diameter

  3. radius

  4. normal
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D Correct answer
Explanation

By geometric definition, the radius of a circle is perpendicular to the tangent at the point of contact. This line is referred to as the normal to the circle at that point.

AI explanation

A line perpendicular to the tangent at the point of contact on a curve is defined as the normal. Since the radius to the point of contact is always perpendicular to the tangent, the line containing this radius is called the normal to the circle.

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