Math Day 1&2
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Circle
set of coplainer points equidistant from a given point


radius
a segment starting at the center and ending on the circle

Rule
all radii in a circle are equal or congruent

chord
a segment starting and ending on the circle at different points

diameter
a chord that contains or goes through the center

secant
a coplainer line that contains a chord

Tangent
a coplainer line that intersects a cicle at only one point

Point of Tangency
the point where the tangent and the circle meet

Congruent Circles
two or more circles that have congruent or equal radii

Concentric circles
two or more coplainer circles with the same center

sphere
the set of points equidistant from a given point (3D)

Common Tangent
a coplainer line that is tangent to two coplainer circles

Internal Common Tangent
a common tangent the intersects the segment joining the two centers

External Common Tangent
a common tangent that does not intersect the segment joining the two centers

Tangent circles
two coplainier circles that intersect at only one point

internally tangent circles
two coplainier circles that are tangent with one inside the other

externally tangent circles
two coplainier tangent circles that are not inside of each other

arc
a set of points that are part of a circle starting and ending at different points

minor arc
an arc that is less than half the circle (two letters)

major arc
an arc that is more than half the circle (three letters)

SemiCircle
an arc that is equal to one half the circle (three letters if possiable)

Arc addition postulate
if two arcs have a common end point only then the measure of the first arc plus the measure of the second arc equal the measure of the new arc form

congruent arcs
two arcs on the same circle (or congrunet circles) that have the same or equal measures

midpoint of an arc
the point on an arc that divides the arc into two equal or congruent parts

Inscribed polygon
a polygon drawn inside a circle with all vertics on the circle

Circumscribed circle
a circle drwn around a polygon touching all vertices

Inscribed circle
a circle drawn inside a polygon touching all sides

Circumscribed polygon
a polygon drawn around a circle with all sides touching the circle