Circle Properties
In the same circle or in congruent circles, all radii are _?_.
equal
A line that has one and only one point in common with a circle
tangent
A central angle is measured by _?_
its intercepted arc
In the same circle or in congruent circles, two central angles are equal if _?_.
the arcs which they intercept are equal
The longest chord in a circle is the _?_.
diameter
A circle is determined by a given point as _?_ and a given line as _?_.
center / radius
A straight line that cuts the circle in two points
secant
An inscribed angle is measured by _?_
1/2 its intercepted arc
In the same circle or in congruent circles, two arcs are equal if _?_.
The central angles which they subtend are equal OR if the chords they subtend are equal
An angle inscribed in a semicircle is a(n) _?_ (what kind) angle.
right
If the radius of a circle is 3 in., a point that is 5 in. from the center will be _?_ (inside, outside, on) the circle.
outside
A figure bounded by an arc of a circle and its chord
segment
An angle formed by two chords intersecting in a circle is measured by _?_
1/2 the sum of the intercepted arcs on either side
In the same circle or in congruent circles, two chords are equal if _?_.
the arcs they subtend are equal OR if they are equally distant from the center
A diameter or radius perpendicular to a chord _?_ (does what) the chord and the arcs subtended by it.
bisects
Circles having equal radii or equal diameters are _?_.
congruent
The line that joins the centers of two circles
center segment (or center line)
How many common tangents do two circles have if one is wholly without the other?
4
Tangents drawn to a circle from an external point are _?_.
equal
An angle formed by two secants intersecting outside of a circle is measured by _?_.
1/2 the difference of the intercepted arcs
Two circles which have the same center are _?_.
concentric
The chord joining the points of intersection of two intersecting circles
common chord
How many common tangents do two intersecting circles have?
2
Arcs intercepted between _?_ lines are equal.
parallel
Tangents to a circle at the ends of a diameter are _?_.
parallel