When you draw straight lines that cross or touch a circle, you get different types: secant, tangent, and chord. The radius and diameter are also special lines of the circle.
A secant is a line that crosses the circle at two different points, passing through its interior.
A tangent is a line that touches the circle at exactly one point. It forms a 90° angle with the radius at the point of contact.
A chord is a straight line that connects two points on the circle without passing through the center. The diameter is the longest possible chord, since it passes through the center.
The diameter is the longest possible chord.
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