Terms in this set (25)
Segment from center of circle to edge
All the way across and hits the middle.
Inside the circle and is a segment whose endpoints are on the circle.
Line that 'touches' the circle in one place.
The point where the tangent line touches the circle
Line that passes through the circle intersecting two points.
External tangent congruence theorem:
Tangent segments from a common external point are congruent.
An angle whose vertex is in the center of the circle. Degree of arc = degree of angle.
smaller than half the semicircle.
an arc that is half the circle. Safer to have three letters in name.
Greater than the semicircle. It has to have three letters in the name.
What is the measurement of a minor arc?
less than 180.
What is the measurement of a semicircle?
What is the measurement of a major arc?
More than 180.
Congruent circles theorem:
Two circles are congruent if they have the same radius.
Congruent central angles theorem:
In the same circle two minor arcs are congruent if their corresponding central angles are congruent.
The area around the outside of the circle.
is a closed segment of a differential curve.
an angle whose vertex is on a circle. Arc doubles from inside angle.
Inscribed angles of a circle theorem:
If they overlap in the same place, they will share the same measurements.
All vertexes lie on the circle.
Inscribed right triangle:
A right triangle is inscribed in the circle if the hypotenuse is a diameter of the circle.
If they intersect inside the circle:
Measure of angle ne +1/2 dc +bc
If they intersect outside the circle:
Measure of angle aec + 1/2 ac -ad