Learn how to show that a line is tangent to a circle by applying the quadratic formula

The video tutorial explains how to determine if a line is tangent to a circle. It begins by defining a tangent line as one that touches the circle at exactly one point and forms a right angle with the radius. The instructor then demonstrates how to use the Pythagorean theorem to verify if a line is tangent by checking if the theorem holds true, indicating a right angle. The example provided involves calculating squares of given lengths and confirming the equality. The tutorial concludes by applying this method to solve related questions.

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