Question

a line that touches a circle at exactly one point is called a ________. the point where a tangent line meets the circle is called the ______. the distance from the center of the circle to the point of tangency is the ______. tangent lines are ______ to the radius at the point of tangency. a line that intersects a circle at two points is called a ______. the circle that passes through all the vertices of a polygon is called the ______. tangent segments from a common external point are ________.

Explanation:

1. By definition, a line that touches a circle at exactly one - point is a tangent.
2. The point of contact between a tangent and a circle is the point of tangency.
3. The distance from the center of a circle to the point of tangency is the radius.
4. A fundamental property of tangents is that they are perpendicular to the radius at the point of tangency.
5. A line that intersects a circle at two points is a secant.
6. The circle passing through all vertices of a polygon is the circum - circle.
7. Tangent segments from a common external point to a circle are congruent.

Answer:

1. Tangent
2. Point of tangency
3. Radius
4. Perpendicular
5. Secant
6. Circum - circle
7. Congruent