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Set of all points in a plane that are equidistant fron a point. Circle

Coplanar circles that intersect in one point. Tangent circles

Segment whose endpoints are the center and any point on a circle. Radius

Segment whose endpoints are on a circle. Chord

Chord that contains the center of the circle. Diameter

line that intersects a circle in tow points Secant

line in the plane of a circle that intersect the circle in exactly one point. Tangent

Point where the tangent intersects the circle. Point of Tangency

Coplanar circles that have a common center. Concentric circles

A mathematical constant commonly approximated as 3.14159. Pi

An angle whose vertex is the center of the circle. Central angle

It is an arc with endpoints that are the enpoints of a diameter. Semicircle

Two arcs of the same circle that intersect at exactly one point. Adjacent arcs

An angle whose vertex is on a circle and whose sides contain chords of the circle. Inscribed angle

An arc that lies between two lines, rays, or segments. Intercepted arc

A polygon when all its vertices lie on a circle. Inscribed polygon

The circle that contains the vertices. Circumscribed circle

Angle whose sides are tangent to a circle. Circumscribed angle

Segment that is tangent to a circle at an endpoint. Tangent segment

Segment that contains a chord of a circle and has exactly one Secant segment

The part of a secant segment that is outside the circle. External segment

When two chords intersect in the intirior of a circle and each chord is divide in segments. Segments of the chord

It is a closed curve or circular object is the linear distance around its edge. Circumference

Real number that can't be expressed as a ratio of integers as a fraction. Irrational number

Mathematician who used Pi symbol for first time to represent the platonic concept. William Jones

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month Pi Day is celebrated March

total length around the outside of a closed figure Perimeter

comparison of two numbers ratio

distance around the outside of a circle circumference

ratio of the circumference of a circle to its diameter pi

amount of space occupied by a 3D figure volume

branch of math that deals with lines, points, angles, etc... geometry

distance from the center of the circle to it's circumference radius

line that passes through the center of a circle diameter

curved surface that looks like a ball sphere

3D figure that has two circular faces that are parallel cylinder

did the first calculation of pi Achimedes

closed, round shape circle

decimal number that can't be written as a simple fraction irrational

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a segment whose endpoints are the center and any point on a circle radius

chord that contains the center of a circle diameter

the point from which all points on a circle are equidistant center

an angle whose vertex is the center of a circle central angle

the distance around a circle circumference

an angle whose vertex is on a circle and whose sides contain chords of the circle inscribed angle

a segment whose endpoints are on a circle chord

a line that intersects a circle in two points secant line

an arc with endpoints that are the endpoints of a diameter semicircle

a line in the plane of a circle that intersects the circle at exactly one point tangent line

if the endpoints of a chord or arc lie on the sides of an inscribed angle, the chord or arc is said to subtend the angle subtend

coplanar circles that intersect in one point tangent circles

an arc that lies between two lines, rays or segments intercepted arc

an angle whose sides are tangent to a circle circumscribed angle

a part of the circumference of a circle arc

a circle that contains all the vertices of an inscribed polygon circumscribed circle

coplanar circles that have a common center concentric circles

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A portion of a circle defined by two endpoints arc

A segment with endpoints at the center and on the circle radius

A segment with endpoints on the circle chord

An irrational number =C/d pi

Set of points in a plane equidistant from the center circle

A line in the same plane as the circle which intersects the circle in exactly on point tangent

When every side of the polygon is tangent to the circle circumscribedpolygons

A chord that passes through the center diameter

Region bounded by an arc and a chord segmentofcircle

Region bounded by a central angle and its intercepts arc sectorofcircle

An arc greater than 180 degrees majorarc

Arc formed by an inscribed angle interceptedarc

When all vertices of a polygon lie on the circle inscribed

When two circles have congruent radii congruent

A line that intersects a circle in exactly two points secant

Has a vertex on a circle and sides that contains cords of a circle inscribedangle

Point where a tangent line touches a circle pointoftangency

A segment of a secant line that has exactly one endpoint on the circle secantsegment

A secant segment that lies in the exterior of the circle externalsecantsegment

Segment of a tangent with one endpoint on the circle tangentsegment

Arcs in a circle that have exactly one point in common adjacentarcs

Line, ray, or segment this is tangent to two circles in the same plane commontangent

Arcs with the same measurement congruentarcs

An arc equal to 180 degrees semicircle

Two segments created by two chords intersecting in a circle chordsegment

When circles are coplanar and have the same center concentric

An arc less than 180 degress minorarc

An angle with the vertex in the center of the circle centralangle

A circle is ________ about a polygon if it contains all vertices of that polygon circumscribed

Distance between two endpoints along an arc measured in linear units arclength

Distance around a circle circumference

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