The Tangent Line to Circle Theorem states that a line is tangent to a circle if and only if it's perpendicular to the circle's radius.
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Such a line is called a tangent line or a tangent to the circle. [Tangent is Latin for touching-- a tangent line touches the circle at just one point. ]
Is calleda tangent line. Is called a tangent line
Two lines tangent to a circle at the endpoints of its diameter are parallel. See related link for proof.
A tangent line is always perpendicular to the radius.
No. A tangent touches the circle at exactly one point. A line that intersects a circle at exactly two points is a secant.