What is the definition of a tangent line to a circle

The video tutorial discusses angles within a circle, such as central and inscribed angles, and introduces chords. It then shifts focus to tangent lines, explaining that a tangent line is a line that intersects a circle at exactly one point and is perpendicular to the radius at that point. The tutorial emphasizes the properties of tangent lines and their geometric significance.

What type of angle is formed when the vertex is at the center of the circle?

• Supplementary angle

• Exterior angle

• Central angle

• Inscribed angle

Which of the following best describes a tangent line?

• A line that intersects the circle at two points

• A line that is parallel to a chord

• A line that touches the circle at exactly one point

• A line that is perpendicular to a diameter

How does a tangent line relate to the radius of a circle?

• It intersects the radius at two points

• It forms an acute angle with the radius

• It is perpendicular to the radius

• It is parallel to the radius

What is the significance of a tangent line being perpendicular to the radius?

• It ensures the line is a secant

• It confirms the line is tangent

• It indicates the line is a chord

• It makes the line a diameter

If a line is tangent to a circle, how many points does it intersect the circle at?

• Two points

• No points

• Three points

• One point