Vocabulary 10a
A segment that extends from the center of the circle to a point on the circle
Radius
A segment whose endpoints are on the circle.
Chord
An angle whose vertex is outside of the circle and whose sides are tangent or secant to the circle.
Circumscribed Angle
A shape in which all of the points are equal distance from the center.
Circle
An angle whose vertex is at the center of the circle.
Central Angle
A chord that goes through the center of a circle.
Diameter
The point in the middle of a circle.
Center
An arc whose measure is less than 180 degrees.
Minor Arc
An arc whose measure is exactly 180 degrees.
Semi-Circle
An arc whose measure is greater than 180 degrees.
Major Arc
A line that touches a circle in exactly one point.
A Tangent Line
Two circles that touch each other in exactly one point
Tangent Circles
Two circles that share a line that intersects it only once and does not cross the line that connects the centers of the two circles.
External Common Tangent Line
If the measure of the arc of an INSCRIBED ANGLE is 140 degrees, how much is the angle?
70 degrees
If a CIRCUMSCRIBED ANGLE has a small arc of 35 degrees and a large arc 65 degrees, then the measure of the angle is ________ degrees.
15
A line that intersects a circle in two points.
A Secant Line.
A line that is tangent to two circles.
Common Tangent.
The circle that contains the inscribed polygon inside of it is called a ___________________
Circumscribed Circle
If the measure of an INSCRIBED ANGLE is 50 degrees, then the measure of the arc that it intercepts is ________ degrees.
100
Two circles that share a line that intersects it only once and does cross the line that connects the centers of the two circles.
Internal Common Tangent Line
The place where the Tangent line touches the circle.
Point of Tangency.
Two circles that share a center, but do not intersect each other.
Concentric Circles
If a CENTRAL ANGLE is 60 degrees, the measure of the arc that it intercepts is __________ degrees.
60
A polygon whose vertices are on the circle and whose sides are inside the circle.
Inscribed Polygon
An angle whose vertex is on the circle.
Inscribed Angle