Geometry Chapter 10 Vocab - Glencoe

Geometry Vocabulary

• Center: A point that is equidistant from the endpoints of a line or the extremities of a geometric figure.

• Central Angle: An angle formed by two radii intersecting a circle at two points, with the vertex at the circle's center.

• Chord: A line segment whose endpoints lie on the circumference of a circle.

• Circle: A set of all points in a plane that are equidistant from a given point, known as the center.

• Circumference: The total distance around a circle, essentially its perimeter.

• Circumscribed: A circle is described as circumscribed around a polygon if it encompasses all vertices of that polygon.

• Diameter: A special chord of a circle that runs through its center, equal to twice the radius.

• Inscribed: A polygon is inscribed in a circle if each vertex of the polygon touches the circle.

• Intercepted Arc: For an angle to intercept an arc, specific conditions must be met regarding the endpoints and the arc's positioning relative to the angle.

• Major Arc: An arc that spans an angle measuring 180 degrees or more.

• Minor Arc: An arc measuring less than 180 degrees.

• Pi (π): An irrational number representing the ratio of the circumference of a circle to its diameter, approximately 3.14.

• Point of Tangency: The single point at which a line intersects a circle.

• Radius: A line segment with one endpoint at the center of a circle and the other on the circumference.

• Secants: Lines that cross a circle and intersect it at exactly two points.

• Semi Circle: An arc that measures exactly 180 degrees.

• Tangent: A line that touches a circle at only one point, existing in the plane of the circle.